Need ideas to stop porpoising?

[gss036]

They raised the motor 2 holes for me this morning and we ran it for about 1/2 hr. Did not get any porposing and and was able to get 5950 RPMS(range of WOT 5K-6K) out of it w/2 adults and 90 gal of fuel and the extra 60 lbs of lead in the bow, I just took the lead out as I don't think it will be needed now. I did not check the speed but plenty fast, had to dodge crab pots.
I asked about the 4 blade prop and they were not very eager to go there because of the $500+ cost. I even offered to split the difference on the price increase to swap the prop, but all I got got was no comment or we'll see.