Tom brings up a very good point, you may have had a worked prop that was more like a 24 with plugs out
That is a very heavy boat to expect a 25 to pull full RPM in the summer months
I would start with only one plug with a large hole and go from there. I am surprised you could ever get that rig on plane with 3 plugs in it
A detailed history and all pertinent info P to P rpm, Load etc. may help come up with some answers. Does it have pole on it? It is not unusual for new props to vary a full pitch as well a cup variations. I just bought a new 25 Fury that is tighter than my the 26 Fury I already had, thought I would pick up 200 RPM butt I lost 100 and the hole shot is much slower. Sent it off to Ronnie Gilberts to get it right, in his hands now.