after installing a dp spur cover it was impossible for my 7C pack to fit (arranged in this order - ===| ), so i was going to dremel the cover to fit. after taking it all apart, there is no way i can get it to fit w/ the cover as there is chassis flex without the cover in - the 7C pack is too long. anybody else have this problem? are all the 7C packs extremely tight in a RC18?