If your blade cg's are that far off from each other I'd return them and get a new set. Did you get this heli used or as a package deal? The Venture 50 doesn't come with any blades unless you guys in Australia get them with the kit. If it was used either balance them or get new ones (if you feel it takes way to much weight I'd buy a new set). If it was a package deal depending on where you got the blades from a lot of dealers will exchange them with no problem.