The boat is a Transitional Vee, which means the back angle is flatter than the front Vee and tapers forwards. The issue becomes where there is a flat pitch vehicle area and a drastically angled ramp.
Releasing the strap and letting the boat slip back 2’, 3’ or even 4’ can make unloading easier and let the boat come back faster, missing the spare underneath. Loading can be more of a challenge, as the nose might slip under the roller and depth is very tedious.
A good method on temporary is to use a multi position trailer hitch. You can lower the pitch the ball lower, which changes the trailer angle more normal, then just disconnect and reset the ball height to make a long drive. Short drives you could just run it at a more drastic frame angle. This makes the trailer work normally when this condition exists.
We make a pivot bow stop, made specifically for areas on Ross Barnett, where this condition exists at normal elevations. That remains to be an option and it slightly lifts the boat when unloading, and locks the bow eye in when loading.