Hey Bob, yup the stock build is definitely the way to go. The M-06 is remarkably good out of the box when compared to the M-05. The TRF shocks and aluminum knuckles are all I've done and the car is a gem.
I have found that the rear uprights get a bit sloppy at the lower suspension pin after a collision or two (or 10 in my case) and throw the toe for a loop.
HPRT's suggestion that the motor mount plate can help with cooling is very valid. He pits next to me and believe me, that thing got warm. Running outdoors on more open tracks like you do may have a huge difference on temps, however.
The only build tip I can offer is don't forget to follow the instructions at step 17! (shorten front upper control ball cups by 2mm)
jim