Hi Chris
Yeah, i have the exact same collimator and telescope! after a few attempts, getting it all centered is an absolute breeze, although TBH the only issue i have with it, is the compression ring on the Crayford isnt very good, so when tightening up the grub screw the collimator can sometimes be pushed over at an angle, if you know what i mean.
Glad to hear your having a blast. I was speaking with Skywatcher distribution yesterday, and there will be a 16" before the end of the year ..
so thats where i am headed.