Yes I would agree if a 10 amp fuse blows on the window circuit then you have an issue. From your description everything seems good though so worth a try. The fuse is there to protect wiring but also to protect against overload of motor so unlikely a small increase in value will cause a problem. If you still have door cards off would he tempted to grease the mechanism if it looks like it would benefit.
BTW the radio circuit on same fuse is probably just the keep alive feed for its memory which is why you can still use radio when ignition is on as that's a different feed.
