Ok. I'm embarrassed.
Being a long time SBIG user, you'd think I'd know in which direction to attach an adaptive optics unit.
Until about 3 nights ago... err...well...no.
I was puzzling over why there seemed to be focal-plane tilt in my system....then it dawned on me I'd put the AO on 180 degrees out.
Now everything is orthogonal and wonderful
...and by the way...
here is a link to probably the best H-alpha Image I've ever taken of M16.
(I hate rip-offs so....the image is watermarked....
)