LOL Same here. And my tanks are not 'jerry rigged'!!

A tank can work, sometimes better than a tub, with just a little extra effort. Of course, I'll be the first to say that everyone's home and snake is different and sometimes a tank just doesn't cut it.

Get a good thermostat, make sure the tank is in a good location with all the 'proper' measures taken, and see if things improve. Hopefully they will.