slow to plane

[JimmyDon]

I recently bought a 93 basscat pantera II, had it checked out by a mechanic and was told it was a sound rig, however I noticed it to be very slow to get on plane, I wasnt really aware of issue until I rode on buddy's boat, was a huge difference compared to mine, nose of boat rasises way high and cannot see over even when standing, boat just boggs down for awhile and slowly gets on plane, took to a basscat dealer and they noticed that previous owner had replaced VRO fuel pump with an electronic fuel pump, and claim they cannot hook up for diagnostics until I get it back to OEM specs which requires the VRO fuel pump back on, about $500, they seem to believe this is part of problem. I would hate to shell out the $500 and it not fix the prob, any ideas guys? Here are some important specs:
-19ft
-93 200hp johnson venom GT
-appox 30 gal fuel
-4 blade stainless prop 13 3/4 24 pitch
-25 lbs of gear
-me 160lbs
-new plugs and ignition coils
-compression good