At 5'5" can you move the seat forward of the rear floor mounts (avoiding removal)? Then mount the front and rear of the seat as low as possible! Ideally, it would be fastened to the cage structure and not the floor. If you do bolt it to the floor use large washers/plates with rounded edges on both the seat and floor, use grade 8 hardware and nylocks or other form of self locking nut.

I would think that your seat would be way too high and/or cage too low to have these types of clearance issues at that height.