Regarding the MGM, first of all, i NEVER got cogging. I even do not know
what it is.

The way you want the start is according to your fingers.
If it's smooth, then you will complain the low power.
If it's too hard, complain again on grip and car control.
My choice is a setup of the MGM esc with the start as hard as possible.
MGM talk of seconds and i use the lowest. On the other way, i use exponential on my transmitter.
By doing so, if soft start is needed, just use 1/3rd of the throttle.
If a heavy jump comes when being stop, pull the throttle to max
and it will fly ( It's the real way it goes ).
Driving only truggies, i need HARD breaking due to weight & inertia.
MGM is perfect and i'm nearly digging in the soil on hard braking position.

I use the brake position 6. Still 3 more steps available !!!!
I never use reverse for competition, but i once tried it and it was OK.
Now, i'm waiting the good weather to test the new version.