I have a nylon fuel tank on a 2003 bike and it has swollen from ethanol such that it is tricky to remount after removal because it expands when unconstrained by

I have a nylon fuel tank on a 2003 bike and it has swollen from ethanol such that it is tricky to remount after removal because it expands when unconstrained by the frame. Ducati had a recall over this but Triumph got away without having to do one. I have been running ethanol-free for a few years now because a station is near me but that doesn't fix the problem.