1/10 Tenacity tt pro with an Exotek HD steering kit, aluminum front steering carrier and aluminum rear spindle as only upgrade. Losi diff fluids 30 000 front, 125 000 center, 15 000 rear. The center diff oil enhanced the traction a lot, it’s very nimble and extremely agile. Need to up grade the steering servo for metal geared one to get rid of all that play in the steering. I have been out the hobby for ten years I don’t know what is the brand that give more bang for the buck.
Precision driving is something interesting. Maybe start a video series on YouTube. It as to be realistic for the purpose of the type of vehicle! watch V2VIDS on YouTube he built a MT stadium!