To change the gear mesh, I can reach in the side of the TVP and adjust the motor screws with a 2.5mm ball drivers like these:
Alternatively I can take the motor out with the mount by undoing the two big ass screws holding it in, and adjust it a small bit at a time.
I'll get back to you on the Integy shocks, I don't have my Emaxx to hand. I don't think they are much longer than the UE ones. I'm just a bit concerned I might bend the shafts easily in the stock ones because their length?