I'd also suggest putting in a more powerful servo - these trucks are pretty heavy and if you're running on high grip it's a lot to ask of the low profile servos.
I actually think I preferred the 540 motors. I ran a 6.5 Tekin - it's a lot lighter than the 550 offerings. Gets hot but the Tekin motors can take a bit of heat. I want to try the Tekin 540 sized motor with the large diameter rotor as I think that'll be a nice combo.
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