On wood track set the drop arm up all the way , my car runs fine now standard , all I have done it trued front wheels and back ones on air hubs get some long metric screws and set the body pretty loose
Don't add weight, it will only slow the car down, set the car up well enough to not need weight its very rarely completely necessary. If your popping out you may have too much grip with the ultras which may mean the super grips are better which is what i found at our club
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