If it where me King Tiger and your HL Tiger can be made to run like a champ since I upgraded Mine it runs flawless and that is with metal tracks roadwheels and suspension and the modified HL gearboxes

Tha King Tiger is tricky to get setup perfect but wwell worth it in the long run I have 2 KT hershal and KT porsche and enjoy them both the main thing to do is use speed reducers on the gearboxes and it runs great