I can now confirm the following:

1. RTR shock screws have been thread locked.
2. RTR diffs have just enough oil to coat the gears. Drained them as best I could to replace with my oil and hardly any came out.
3. Getting the diffs out of this thing is a pain in the a$$!
4. RTR motor with 25c 2s Lipo provides better than expected performance. Comparable to Castle Sidewinder SCT system. Soft launch control is default setting. Gearing is just right for top speed on most medium sized tracks. May want to go up a couple teeth for a larger 1/8 track.
5. RTR steering servo is plenty fast enough. Turn the dual rate all the way down.
6. Check all fasteners on RTR. Found several that were not tightened all the way, including wheel nuts.