Reagrding tiller, I'd agree with you that the tips (outer 1/3) could maybe work a bit more.
I re-tillered one yesterday for a guy who'd struggled for a year trying to master 60# but needed it dropped to 50#
I reviewed the pics on my blog and decided the outers could come round a bit more, got it down to 50# and the tiller looked a bit better too

I got a demijohn of cider and a bottle of wine for my trouble so I'sh better nop shnoop by bowsh for a while (hic).
Del