re buying a low profile focuserL
did you actually test your scope and the focal point with your camera?
if not:
Shiraz has explained it so well to me, maybe you'll read
post 13 in this thread.
(note: you would
take out the 1.25 part of your focuser tube to test this. but...read

)
(Don't bother with the posts before post 13.
But maybe, some of the posts following 13 are beneficial for you, too.)