If water was rough while you were out and doing turns, you could be taking water between the cap and hull...my old '74 separated that seam about mid ship and would get very wet turning in rough water...walk around the boat and actually try LIFTING the rub rail...I'm not saying pull out...lift UP...
Also, that's around the time Wellcraft started putting belly tanks in these boats...bow-heavy sounds like you might be getting water up front as BR and RW suggest thru a fitting and it's not draining UNDER the tank...lots of water staying up front could keep the bow down...
As suggested, look CLOSELY all under the hull along the lifting strakes for splits thru the hull...
If you have plastic thru-hull fittings that don't look bad from outside, get inside and wiggle the hose at the stem and make sure they aren't cracked at the flange...let us know how this comes out...
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'74 V-20/ BF 150
'95 V-21/ BF 150
'84 V-20/ 200 2.4 Merc
'87 V-20/'18 F150 Yamaha
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