My solution for my 2005 Triton Tr-21X, was to manufacture a wedge or shim from a Trex Recycled deck board. As you can see from the photos the deck was about 2° low in the front. The level shows the slope as well. I needed 3/4 of an inch up front to bring it to 0° and level. As an added benefit, it dropped the head of the motor slightly over 2 inches when stowed. That doesn't sound like much but it's much better than before (actually looks way more than that). Before starting anything I measured how the boat sat in the water with a stack of quarters and a level. In the shop I raised the tongue jack until I achieved the same measurement.
Small sample section Trex Board
Reshaped Trex Board into wedge
Painted...
Angle guage without wedge.
Level measurement without wedge.
Wedge installed.
Angle guage with wedge.
Level measurement with wedge.