Almost everybody that has problems with a press fit BB complains about them on the internet
FTFY. As a counterpoint, I've done 4 BB30's on 4 different bikes and all are fine. Yet the square taper BB on my old crosser needed replacing every 1,000 miles....
There will always be exceptions to a rule - I guess you have been very lucky with your BB30's and very unlucky with your square taper.
I must say that while talking about BB types I have not been overly impressed with Hollowtech BB's - and have see some of them fail with less than 2000 miles.
This frameset defo warrants it.......I had issues after a couple of hundred miles (fixed by grease), then again after a thousand or so (tried regreasing, then a new bearing kit). I seem to have now permanently (hopefully) resolved the issue with loctite. From my understanding none of the conversion kits solve the fundamental issue. Would I get BB30a again, probably but only if the rest of the bike merited it.
This frameset defo warrants it.......