I have a Mercury 90 HP Four stroke with a max RPM (WOT): 5000-6000

With my default 19" black max (3 blade) RPM wide open is about 5900
RPM. I tested with a 17" black max and it did 6200 rpm.

I expect my newly ordered Trophy Plus 17" (4 blade) to do about 6150
RPM. Is this amount of revs a problem for this engine, or should I be
gentle with my right hand thus keeping it under 6000?

(following question comes to mind: how accurate is my factory fitted
mercury rev meter?)