So, after a trip to the hardware store for shims and experimenting with those for a couple hours I really don’t feel that I’ve gotten anywhere.
I’ve created Frankenstein-like combinations of two shims to no real avail.
The degree of tilt never changed by any worth while amount. Although, and I feel a little dumb saying this, I discovered that the problem of balancing everything didn’t lie with elevating the left, but rather the right side. You see the floor actually slopes up. So my knee jerk reaction at seeing the water level lower on the left was wrong. The water was showing true level the whole time.
At one point I had the entire right end elevated but then became concerned about the middle support. As designed it should sit flush with the side panels, however much of it became elevated so as to be taller than even than even two shims combined. note image of the shims with the line drawn across representing how far each had gone in between the bottom shim and the unit.
The middle support rests flush without the shims making me think this may all be a bit superfluous, the unit is supported throughout without all the extra elevation.
The building is older, approximately 1920’s or 30’s, so it has a little character like angled floors.
I’m thinking tomorrow that I’ll try to place, if not also cut, a yoga mat beneath the entire unit and see if that helps at all.
Photo 1: the space on the bottom which is higher than a single shim
Photo 2: how far each second shim went in
Photo 3: the top is before, bottom is after