I have an idea for adjustable tab lowering.

[Bad Company]

It's worth a try. Let me explain this the best I can. This is for the front. I haven't figured out how to the rear yet, so I'm open to suggestions. You will have to remove the existing tab. You cut and bend 2 pieces of credit card like the blue in the pic. Next cut and glue together 3 pieces like the red. The tab sticking out at 90 degrees will be at 3 different levels or more if you perfer. In this case I will go with 3. One at 1/2, one at 1/4(1/2 between the first 1/2 and bottom), and one at 1/8(1/2 between 1/4 and bottom). You can actually flip the 1/4 and 1/8 piece around to raise the body. Next, you glue the 2 blue pieces to the chassis like in the pic. You have to do this so that the red pieces will slide in and out from the side, but the blue pieces have to put enough pressure to hold them in. In effect, the blue pieces will hold the red against the chassis. The you just swith out the red pieces with whatever height you want. I will try this myself later, but I don't see why it won't work. I'm still working on how to do this to the rear without restricting access to the heatsink screw and motor.