A small update.
I have replaced the focuser with a Feather Touch 3.5 inch, wow, what a bit of kit that is and I have also replaced my 12nm QHY narrow band filters with some Baader narrow bands of about 7 and 8 nm, which I have blackened the edges, of including my LRGB set, so Baaders all round.
I have only had the chance to do some focus testing and tweaking as the step size had changed a tiny bit and although I tried both objects that were originally a problem and didn't see any issues it is still too early to tell.
Thanks to everyone I have dealt with lately through IIS Classifieds, I hope to reward you all with some really good images.
Updates as soon as the weather allows, here's hoping it is good news!