It's been so long that I literally forgot about that leaning condition. Interesting solution. Glad it works.
The original Savage tanks with the plunger (used to prime the fuel) were notorious for that.
I added an extra o-ring to the front post (under the fuel tanks lip) to give the tank a rearward tilt to resolve the issue.
You also get the benefit of drawing the fuel through the tanks sintered filter instead of needing to add an inline filter.
The original tanks didn't even have the sintered filter it was just a straight draw through the plunger mechanism.