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Technically speaking you can still get differential flexure when using an OAG, but it's due to either user error (prism stalk not secured), or manufacturing defect. I've noticed the former before.
Anyway, don't fix what ain't broken, Lewis. It's the results that count in this case and you should do whatever works for you and you're most comfortable with.
Just be aware that with different kit you'll have better success... as had been said, guide scopes and floppy mirrors don't tend to mix well. Another consideration is the sampling rate of the guide scope... yes, guiding software does do subpixel centroiding, but how well is it really going to work if you're getting 10"/px through a tiny guide scope?
Again though, if it works, keep doing it. This hobby is difficult enough without "fixing" things that work for the sake of dogma.
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