For years I used a cheapo vest I got at Walmart, finally got tired of it riding up my back and it was too hot on a warm day. I recently tried a Stohlquist Fisherman High Back Life Jacket in a Eddyline Calypso kayak in a river trip and it was comfortable (the vest was comfortable, the Calypso was not so much and it dumped me in the river when I turned to look behind me. The Calypso made me realize how much I love my PA!). I need to try it in my Pro Angler but I don't know if the high back of that PFD will clear the high seat of the PA.
What are you using?

Our Inflatable PFD's are not the auto style - they are manual - so they will only inflate if triggered by the user.

I don't know the exact numbers, but in Canada, more people die in small boats like kayaks and canoes, than in motorboats, or larger sailboats etc. It's a BIG difference. Exposure to the water seems to be the common factor. Drinking is often a big factor in those deaths too. And the deaths are rarely white water rafting etc. It's almost always small lakes where you'd think someone should be very safe. It's been about 15 years since I remember someone dying from a whitewater incident in my area, and we have several deaths every year from canoe misadventures.

Personally, I think those inflatable life jackets should only be used by people on the larger boats. The Police wear them around here on their motorboats. If you're on anything with a Hobie name on it, the safest thing to wear is a traditional life jacket. There are plenty of styles to get comfortable on the variety of seats, trapezes, etc.

That's just my opinion, and I don't mean to say that I'm right, and someone else is wrong.

I don't have a PA, and I'm sure you've already tried this, but just in case you haven't, is there a way to adjust the vest? My shoulder straps can shorten a little bit, and it still remains comfortable.