It's too late! Have the 960 on its way to me now.
A few other things have changed since then too, like my methods to get a nasal mask working effectively and I will be a bit more bold with settings experimentation. Of course I would not fight against futility if the machine was that bad, but hopefully I'll 'adapt'
Looking back through some of goodonya's experiences, it also seems the Respironics algorithm doesn't really suit his disposition. Not sure if my arousals were just more sudden PS related which might be an issue on Resmed too. My memory of the period isn't too sharp so will have to get back to basics.
Might just leave settings wide open for a bit and see what the machine thinks, I know setting the EPAP near my 95% the last time isn't necessarily a golden ticket as the 95% is just that pressure or below on Resmed I think, so could spend a lot of the night below that.