[Nuttyman54]

I can't comment on the 775pro yet since we just ordered them, but I do recall in 2014 we encountered a similar problem with our VP's running RS550s. It wasn't quite to that extreme, but they were very touchy with how they were assembled as to how much friction they had inherent to the gearbox. I would suggest disassembling the gearbox (or at least loosening the screws a bit) and trying it again.