Swim advice...video included

Nice video and I can say you have a nice stroke.  With that said, I think I can give a few pointers.

I think you could improve your 100 times pretty substantially without changing your perceived effort or HR  with 2 minor modifications.  The first is very easy.

Make sure you are swimming with your fingers together.  It was hard to be 100% sure but it did look like there were a few spots in your video that your fingers seemed to be apart.  You want to scoop as much water as possible and closed fingers will do this.

Second, you are missing a big opportunity at forward propulsion in your pull.  I will do my best to explain but a picture or video may do more good.  When your arm enters the water you pull down all the way to the bottom and then behind you.  You can acheive even more pull with a slight change.  My high school swim coach used to describe it as pulling over a barrel.  You want the arm to enter and go down like yours does.  Then, when it is somewhere near diagonal out in front facing forward toward the bottom of the pool, you start the pull over a barrel.  You will bend your elbow and pull "over the barrel" underneath your body.  This gives you much greater forward propulsion and keeps your pull from sinking your back side.  After you come over the barrel you will extend the arm with a final push and finish with your hand beside your thigh and your arm completely extended.

I am sure it is hard to picture based on what I have written but this website seems to do a pretty good job of explaining the correct and incorrect with both pics and video.  Disclaimer: I am not affiliated with this website and only found it by a simple goodle search.

???www.swimsmooth.com/catch.html

You have a very good base for a swim stroke and I think with these minor changes you could see your times really skyrocket without any extra fatigue in the water.

Looks pretty good to me.  I know I should have learned my lesson posting my opinion about people's swim stroke..but oh well, here I go again.

You have a pretty high turnover rate with little emphasis on gliding through the water.  I would try to practice slowing down and feeling the glide portion of your stroke.  It looks like you have a powerful stroke.  I would try this:  Only start your pull when your recovery hand is coming just in front of your head.  You have a quick pull, so it should slow you down at all, it will just give you a tiny bit more time in extension and allow you to glide a bit.

If you want to, I would also look at initiating that catch a bit sooner too.

Doing a great job, though!

I apologize as I am a very straight shooter so don't take this too badly.

What's good is most of the time you swim in a nice straight line (occasionally fishtail but not bad at all) and you have a good flat position in the water, not planing with head up and legs sinking. You have a very nice two-beat kick; the legs tend to splay out a bit far when you kick with your right leg, but not too bad. (Not an area to focus on yet, in other words).

As for entry: you sort of stroke the top of the water. Spear it. Get that arm extended and out there.

^^^Part of this is that you are also flat in the water in terms of body rotation, which you don't want. You want to get that arm extended: think of reaching for something on a high shelf. Do you stay flat and flop your arm up? Nope--you rotate your body and reach the arm. (I'm sure someone can recommend a focus or drill to help).

Watch your video in super slow mo, frame by frame. You'll be able to spot many of your own areas for improvement.

Catch: you are dropping your elbow. Think of reaching to put something big under your arm (the "swimming over barrels" analogy and drill, Google it if need be). Then pull that big thing back.

There's plenty else (there is for all of us, trust me!), but those are the biggies I see. As you work on form, my suggestion is to implement one thing at a time (even though, to really confuse things, they're all related).

Thanks very much for the comments and advice so far! I greatly appreciate it. Keep them coming

To give some context on how fast/slow I am, I forget to include that my typical times are in the 2min+ range for 100's. I hover around 31-34 seconds for each 25 (I have one of those counters on my finger and glance at it often when working out). 

I have to disagree with this, your fingers should be slightly apart when swimming

We may be talking about the same thing but you will have to break this down for me.  I don't think you should put extreme effort into never letting your fingers move apart and there will obviously be a small amount of water flow between your fingers.  You want to be able to cup as much water as possible without allowing all of the water to flow between your fingers.  This will make a paddle out of your hands so to speak.  That may be your definition of slightly apart and we may mean the same thing.  If not then I would love to know what you mean.

x2, AdventureBear just gave you the perfect explanation. In my mind "Make sure you are swimming with your fingers together" is completely different than swimming with a relaxed hand.

THINK OF THE TRAGEDY!!!