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I had the same trouble with my 1983 Outrage... I felt like there was some suction holding the tank in. I thought slow steady pressure might pull the tank out. And it did.

I managed to slip a tie down strap/ratchet underneath a front corner of the tank after scraping out the foam from around the entire tank. I then attached a large C-clamp to the rafters above my boat in the garage in a very secure fashion. Using the tongue jack on the trailer, I cranked the bow of the boat all of the way up. Then, I attached the strap to the C-clamp and tightened it with the ratchet so it formed a loop under the tank and around the clamp attached to the rafters. Finally, I lowered the tongue jack, leaving the bow of the boat slightly suspended (an inch or two) by the tank. Then I left it.

When I returned a couple hours later, the boat was resting comfortably on the trailer and the tank was lifted up. More than anything else, I think the tank is stuck in there with adhesive which will give under time and pressure.