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Andy
I originally looked the Bintel CC but after researching a bit I chose a Baader MCCP mk111 coma corrector for my Canon 600D and no issues at all with focus in either of my 6 or 8 newts
Its a quality optical accessory, pin point stars to edge of field , no coma what so ever , they are pricy but they work exceptionally well
If you still have trouble with back focus , maybe try some 4mm thick x 15mm diamter round cork spacers ( Bunnings ) under your primary mirror to bring it forward , it may give you a bit more focus ( I did that to my 6 F6 newt prior to buying a coma corrector)
Martin
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