10 ozs is excellent! Last time I checked the rule book for 1/2A pylon they had to weigh 20 ozs minimum[OINK!] No problem, if you want to race AMA rulebook all you have to do is tape something onto your plane that weighs 10 ozs, like 1/4" steel plate that measures 3"by3"
! Let us know if you find the cause of the crash, it's always good to get a FYI if you got let down by bad equipment. With a 1/2A it is hard to get a plane to balance if the engine isn't sticking out somewhat, you've done a good job of getting all the heavy stuff in front of the CG.