How is your hearing? Are you also using a crazy motor (as above)? I always recommend starting small and slower... Then moving up from there. This way you 'learn the kit' so to speak. Each small adjustment will provide information about what works and what does not.
Explain what your car is...
I wish I caught this earlier! For a straigh axl, using a motor that hot is crazy. You are Def on the right track using a lower rpm motor. Those kits were designed a LONG time before super hot winds when brushed.
I have seen similar issues at (1:1) track. Someone takes a basically stick vehicle...