(11s and 22s) Heads up Play

So I primarily play the 22s on PP after moving up from the 11s a while ago.

After PT my stats, i realized that i only win about 40% of my heads up. I consider myself a good HU player, as i used to win the HU matches on UB and just in B&M games and such, and everytime i go into a HU situation i usually consider myself the better player.

One reason i think my win% is so low is that i tend to take coin flips a lot in HU, especially when the blinds are high.
As we know, PP has a horrible blind structure where HU at the end becomes 4k chip stacks and 300/600 blinds. I constantly run into LAG pushbots who are pushing with everything, and many times after folding a couple consecutive hands i find myself shortstacked and then call with a losing hand. Usually my play is based off the HoH model with the 10%, 20%, and 30% hands and situations, but i find that i have trouble with large blind situations.

I think i can isolate my HU problem to that because I tend to be able to outplay my opponent when there is more flexibility in betting and soforth

any thoughts?