OEM pegs are designed to flip up and back for exactly that reason.
Chances are that if you had the OEM pegs on the peg would have lost the feeler, maybe.
Because your peg couldn't flip up it transferred all the force to the next weakest component.
Glad you didn't come off and it only cost a couple of hundred bucks to fix, but I'd be wary of cornering hard with those pegs on again. Next time you might not be so lucky.
Actually Boomer, that's kind of why I've switched back to the stockers. The Buell pegs do utilize the stock spring and action of swinging up and back. But my real problem was 1) my position in the lane placing the peg in such a way that it was directly in the line of the dot, and 2) that my somewhat agressive riding style put that peg firmly on the ground as I rounded the corner. Knowing that peg took such a hit had me thinking, "no way I'm trusting that peg anymore!" But I think my 1-2 punch of "bad" line and body position would have still destroyed the stock peg and feeler, and probably that frame bracket too.
My general riding had compleatly ground off the feeler and about a half inch of the stock pegs mass. Riding with my body and bike in line into a corner put much of the peg in danger of grinding away. As I've "matured" as a rider, I now shift my body mass to the inside and keep the bike more upright. I still nick the stock pegs now and then, but no where near what I did with them in the first year, and then with MCL brackets the second year, and even less so than with the Buellers.
Another item that allowed me to return to the stock pegs and height were Larry B's highway bars. Now if I'm in the twisties I can keep the up-tight foot position and on the relaxing straghts, put my foot up. That was the whole reason for going with a more relaxed peg position of the Buell pegs. I have horrendous knee joints and giraffe legs that don't fold so well.
Yep, feel lucky I didn't go down or have anything other than a story to tell and a couple hundred less dollars in my wallet, but I also feel more confidant in the stability of this bike in almost any riding situation. My lastest 2000 mile journey had me at Wolf Pen Gap and Deals Gap for a bit more than a week. Only tickled the pegs once and only for a nano second. But still roasted a rear tire to it's limits though!
Mike