Fish nautique rpm questions

So I’m back haha dumb questions incoming put on your helmets…

I have a 14x11 iirc prop boat hops up out of the hole doesn’t seem to struggle even with a load but seems like wide open only 23-2500rpm showing on the tach. (Could my tach be broken?)

To me seems like that’s low,

Whats a pcm 351 suppose to turn wot

How do I check I’m getting full wot on the carb??

I was cruisings around 23-25mph at 2000ish rpm until we decided to try and wot to see what we could top out at and only got it to 30mph and engine sounded like it was revving higher than tach was showing but what do I know.

I can’t open engine box while running at speed since it’s inside the cabin and it can’t be removed without taking the whole back wall off the boat wish I remembered how to post pictures on this site