I use the same setup for 17.5 stock and 21.5 VTA.
The only major difference other than tires (32 sweep WCICS spec tire vs HPI vta tread D compound) is the amount of SXT on the front tires. Full for low grip carpet, none for high grip carpet. Half or quarter for anything in between.
I also run a 2 degree RR block in VTA, as the HPI rear tires are so fat and wide. 3 degree RR block in the TC stock for more stability.
People who have driven my car say that it is smooth and very predictable. Looks like I'm going to have some downtime at the office. Let me see if I can repost a more visible photo.