Haha. I think that motor should have tons of low end since its from a savage. Try some different gears like jam said. I'm not sure about that motor but it looks like your tune on the high speed needle is pretty lean. Go back to the baseline settings on everything including idle opening. Just...
It does sound really good on the top end. I can hear it kicking in like a powerband. Try to post some pictures of the car with the body off. I don't know what a .21 bb is. Is that an old motor with ball bearings?
don't worry, you will trash bodies so fast you learn to paint fast. I always like to have at least 3 bodies. One on the truck getting beat. One nice painted one for on the shelf and painting one. You gotta keep them in rotation.