Thanks it sounds like I need to do a lot of testing. I put a ec90 on my current TT bike but after about 2 hours I am getting some pain. I figured people might have been able to steer me in the right direction. Channel vs open front. I will review the shapes a bit more and collect a few over the next few weeks.
The ISM looks super chunky and if being honest not that comfortable but had decent reviews on tri-forums.