Interesting. You are suggesting the PR2's have a stability problem. That is heresy on this forum. As far as I can recall, in 5 years only you, me and one other has ever posted anything negative about the PR2. By the way, I also blew a front rim hitting a softball sized rock.
I think what he is posting is that he had a problem with one set of PR2s.
As for the heresy, I think you'll find that most of us PR2/PR3 devotees will abandon them as soon as something better comes along. I know I will.

Personally I haven't tried the BT023s as I haven't needed to.
I changed from the BT021 because they were not just bad, but bordering on dangerous.
A great many other people agreed whereas I have only heard of a few people who prefer the BT021 over the PR2.
My personal experiences of the Exedras, BT45, BT-020 and BT021 have led me to the conclusion that Bridgestone don't make tyres for me. They seem to sell enough so I guess that some people like them.
In the past I was a Metzeler Z6 devotee on the C10 and before that I was an Avon Azaro devotee and before that a Michelin 89/90/100 devotee. I go where the performance is. I'm not a brand junkie.
I once broke a rim by ramming it into the side of a Volvo 240 at 60Mph. Does that count? <LOL>