I'll try the weights first. Also when I got my Tiger from my local hobby store the plastic strips that are right above the tracks that run front to rear on the lower hull were bowed a bit and I've noticed a gap between the upper hull and lower when I put the top on and click it in. I've tried attaching a strip of thin firm metal to each side however it didn't straighten it out at all. I'll see if I can get a picture of it to better explain