I'm running a 225lb in mine. As is someone else I know.
We both ride two up a lot, and run reverse cone cans. With a passenger on, there's barely any movement left for going over bumps.
Are other people using a fatter spring? Or, just living with the banging off the bump stop?
None of us is a big fat oik. 13 1/2 stone for rider. Tops of 9 1/2 stone for passenger.
I realise the obvious answer is to get a proper shock.. Never-the-less..
Is a bigger spring the answer? One of us is worried about paintwork (not me)

edit for spelling. 17th beer.