I had that issue I went jammin due to the engine. Always like the Force engines
Also talked to a guy that worked at the LHS who owned both, and he said Jammin was better. BTW they sold the hyper 7, and not the jammin so to recommend something they don't sell IMO kinda says something about his honesty

Only things it needs(also what he said to get) is the Z-brace, and the CNC center brace set. Well that and both need a better servo, the OFNA servos suck for steering, and are pretty worthless. Also would swap the radio to a cheap 2.4ghz setup.

Ohh yea I'm no racer never been to a track, and neither was the guy who recommended me the jammin. He was the type of person that jumps RC's over his garage
They also make decent entry level racers on the plus side