Just got around to doing the E127R hack, and am happy to report that it completely fixed my HighGfx mode problems! Totally rock solid.
:banana::drink::drink:
Cool, another one enjoying the best AGA can get

Hey Novacoder, Off topic, but I notice you have an 8GB CF in your A1200. What type is it and any issues in setting it up.?
Cheers
Gertsy
Hiya,
It's an 8GB SanDisk Ultra 2, no problems with setting it up at all and it's now up to 4.5mbs transfer (IDEFIX Express + SpeedyIDE + BlizKick).
I'm running OS3.9 and SFS but I think you should be ok with any OS from 3.1 up as long as you put your boot partition in the first say, 2GB.