'89 Seacraft

[NoBones]

I would find a truck stop with a scale. Weigh the whole rig.
Make note of how much fuel you are carrying as well.
6.5 lbs. to the gallon for gas. Note your water line when at rest. You may have a water logged hull. Do you have trim tabs? Due to the fast entry of these hulls, it is possible to stuff the bow. What size engine do you have? Where are your batteries locatated? Do you have a fresh water tank forward in the bow? Water 8.33 lbs. to the gallon.
Post some pics of your boat. One of us may pick up on something from them.
See ya, Ken