In reply to Taurig:
> However, my Scarpas are too baggy at the heel, too narrow at the forefoot, and too long, so they'd have to go some to be substantially worse!
Have you tried simply wearing socks with them? I know climbing shoes should go on over a bare foot for maximum "sensitivity" and minimal roll/slippage but if they are too big anyway, a pair of socks and lacing them nice and tight can often be helpful, certainly at your grades (and mine!).