Lol I think snot is short "it's not"
WOT stands for "wide open throttle" aka balls out; flat sticks etc etc...
Max rpm for a Yamaha F80 is 5000-6000 rpm so your right at the top end of the range there. Every 1" increase in the pitch of your prop should reduce your max rpm by around 200-250. Using your current prop you need to decide how much more pitch you want based on the different weight loads you encounter on the boat.
ie. if you're getting 6000rpm with an empty boat and no fuel then you could increase prop pitch by 4" making your WOT rpm around 5000. But if you then add a tank of fuel & half a dozen divers you may well be down to 3000 rpm and not even getting on the plane. Not to mention the damage to the engine making it work so hard.
The more props you can beg, borrow and steal to try out the better for finding what works best for you, the boat and the motor.