Half Marathon Pace

Yes, I think your 10K in Oly pace would be a good estimate.  It shows what you can do during a race.  Its not as far as the half, but you had already done the swim and bike.  You may even be a little faster on the half run. 

From your log it looks like you have been doing ~ 7:30 to 7:40 min/mile.  Depending on how hard you do these training runs, you should be about that 7:11 pace in the race.

I recommend being conservative on the first couple miles, and then adjust up to this race pace if you are feeling good.

Using your oly. 10k as a reference, here is what McMillan projects (assuming correct levels of training for the distance attempted):

I agree with JohnnyKay, a 10K would be a reasonable indication of your pace potential for the half assuming you do not start out too fast and then blow up at the longer distance.  If that is not feasible, you could also consider starting tempo runs working up to an hour to get a feel for pacing.  I checked your logs and don't see much in the way of speed work so am not sure if that is something you are already doing or not. 

My April 1/2-marathon pace was 7:22

My June Oly pace for the 10k was 7:31 

However, the course plays a major role.  Both of the above were on flat courses.  Although the Oly was about 10-15 degrees warmer...  So, in general, they are good comparisons (open 1/2-marathon and Oly 10k run).

Just go out and run it and see what happens.  Don't worry about a set pace to run.  Run what your body says you can run.