Tri Suit Ride Up Issue/Questions

I would bet your suit is WAY too big for you.  I've watched kids who were 6'2 - 6'4 160-170 get fitted in a similar suit and they wore a small.

Sounds to me like the suit may not be tailored for the tall and lanky. Each manufacture kind of has its own fit, like some shoes run narrow, some wide, same with clothes and wetsuits, some short, some tall, just depends. 

The fact that you state it pulls your shoulders down and rides up the crotch, sounds to me like its too short, despite being a large. I am 5.11 and 170, I wear a 2 piece, medium bottom and large top. My bottom half is like a 32w, but I push a size 44 chest, so my upper body is still abit stocky.

Your best bet is to call Huub in regards to sizing, perhaps get a different sizing recommendation.

I personally wear Voler FS Pro brand, but I get specialty club pieces through California Triathlon. I have lots of miles of training and 3 Olympic triathlons on them with zero issues.

Here is their tri specific general public offerings: http://www.voler.com/browse/cat3/?cat=mens,tri   

I am basically running the Mens Propel Tri short with a upgraded thicker pad for bike rides up to 6 hours, the standard public offering is good for 3-4 hours. Although if you call them they maybe able to upgrade you if you need it. I also run the mens FS Pro Tri Top. See my profile picture.

Hope you get what you need so you can get in critical practice time before your race. Best wishes on your upcoming HIM, I got my first in just about a month!