Last year I did a 70.3 (Weymouth, UK) and swam 38.51. I was actually quite disappointed as I expected to swim around 35mins. I just wondered if others with similar swim times in the pool could tell me what time you have put down in a 70.3.
In the lead up to the race, 3 times I did a 10x200m pull set off a 3:30 send off, getting 10-15 sec rec. So total time for the 2,000m set was 35min, thus I expected a similar time for the 70.3.
I just wondered if I was expecting too much, or maybe my open water skills need work.
So many variables. You can't compare an average time for a swim set to a race result. Results can vary depending on how you're feeling, whether water is cold/warm,fresh/seawater, choppy, currents, how many in your wave, how well you start, how well you draft, sighting etc.
Your 70.3 race pace was 2.00/100m, 200m (with PB) pace 1.45/100m. So I think your race time is in line with your training. Sans PB you'd probably be doing 2.00/100m for your 200m repeats. My 70.3 pace (27min) would be similar to 200m repeats, probs 2.50 for 200m? Perhaps do a 400m TT, that should give you a rough idea of what to expect in a 70.3. Not sure about others, but my 400m time is close to 70.3 pace with wetsuit.
Personally, considering your ability, I wouldn't be using your PB for a 10 x 200m main set unless it's a once off. If you become over-reliant on artificial buoyancy, PBs, core pants, wetsuits, your swim can suffer. Try doing 10x200m @ 70.3 pace without a PB with 10s rest and see the difference.