Stampy Gearing Question ? ?

[Bondonutz]

I just rebuilt My FLM Stampy after sitting for a year with a bent chassis after getting run over by a Van. I decided to put in a above avarage power plant in it and I'm having a small temp issue.
It's geared 58/12 running on 4s with feeding a Mamba Max and a new HobbyCity 2300KV motor, Castle Voltage regulator/BEC. The ESC has ben tuned down to 80%Punch Control and normal timing. Has good power but not super crazy.
The temps outside during testing are 63degrees. The ESC is ice cold, battery was 84degrees and the motor was 127degrees after a 10 minutes of hard driving and speed runs.
Mr BrianG's Speed calculater says 45mph but theres NO WAY it's even hitting 35mph. I'm a little confused ???

When I ran it previously (befor the van incident) It ran on 3s with a 4600KV Mamba motor and was CRAZY fast and uncontrolable, now it tame and almost lame ?

Do I need to gear up to drop motor temps ??

Pardon the Shizz-ity pictures and messy bench.