And minus 1.4/1.7 IIRC.
There was an AD on the pa28 series several years ago, following a breakup in the US in turbulence, something to do with a modification to the main spar on over 10000hr a/c. That's the only inflight breakup I've heard of, apart from a few that have been involved in spiral dives after entering IMC.
I've done a bit of spinning in pa38's, c152/172, and attempted them in 140's and Airtourers. Closest I could come was a waffly rotation that became a spiral dive. That said, I had a lot more confidence in the structural integrity of the Cherokee over the Tomahawk any day! Probably just a perception thing. The hatchet is a brilliant spin trainer. (Except for the occasional failure to recover situation.) And the 172 is an old lady that prefers to keep a little power on to better stay in the spin. Haven't been game to try anything like this with an aft c/g though. Never will, either.