Re: I gotta raise it an inch
You need to be careful about height when mounting behind a 20'. One problem can be excessive porpoising caused by thrust distance from the hull rocker point. If you increase height, you will possibly need to increase mounting angle as well. Stock transom angle on the 20' is 14 degrees, I believe. Consider wedges if necessary. There's a 20' SF near me with a Merc 250 on a B Bracket, he had to go to 17 degrees, and has trimming difficulties still below 35 mph.
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Common Sense is learning from your mistakes. Wisdom is learning from the other guy's mistakes.
Fr. Frank says:
Jesus liked fishing, too. He even walked on water to get to the boat!
Currently without a SeaCraft 
(2) Pompano 12' fishing kayaks
'73 Cobia 18' prototype "Casting Skiff", 70hp Mercury
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