Well, I got an
APOD with the 12" ACF, Optec TCF-S focuser and F6.7 AP reducer mounted on a G11. That combo worked for me, backfocus wasnt an issue. I would go for the 0.67 reducer, 0.75 isnt worth the bother IMO. The AP 0.67f reducer is VERY well suited to the ACF.. The optec focuser is pretty rock solid and sort of "recommended" for DL and focusmax, it just works, and is an "absolute" focuser (although thats not quite correct). I dont know why your running out of BF with the feathertouch, it must be very long.