Sample rate right now is set at 9600 baud not sure of the spin up time, however the code used calculates RPM very fast from what I can tell. The RPM graph plots fairly nice, with a gradual exponential curve over a couple of seconds. I use a very small, yet strong neodymium magnet and hall effect sensor, and it reads with very little to no noise.

Thinking further to investigate why my ESC blew, I think the weight of the rollers may be too much. I built the rollers based on a comment I found from DamoRC himself where he said to double the weight of the car for each roller.
Using the simpledyno's setup calculator, I think each roller should be closer to 1320.5g, for a target roller mass of 2641g, giving an MOI of 0.003 kg.m^2

Currently each roller weight is approximately 4400g, which gives an MOI of 0.009 kg.m^2. Could this be too much and contributing to the failure of my ESC?

In one of your videos I see you have 24.06 mm^2 set for the flywheel inertia. Looking for your opinion