I seem to have lost track of this discussion. Assuming that your initial 240 tech / 80 EO/IR and 40 Rad hrs and 1,500 wrench bending time per annum per tank are correct (and I have no reason to doubt that they are) then a tech can handle 6 tanks per year, and EO/IR tech can handle 18 tanks per year and a Rad tech 36 tanks per year.
If we take a type 44 Regt then that requires roughly 8 veh techs, 3 EO/IR techs, 3 wpns techs and 2 Rad techs based on the math - roughly 16 total. A type 56 Regt (hell, we're Canada - let's make it a Type 60) would need 10 veh techs / 4 EO/IR / 4 wpns techs / 2 Rad techs - roughly 20.
My own experience with M109s makes that a bit light. Although we only had 6 guns per battery we had about 15 M113, variants, an M578 and about 15 wheeled vehicles to take care of which is more than the tankers, so we would have had more in the area of 30 - 40 veh techs, 4 - 6 EO/IR techs, 4 wpns techs and around 6 - 8 Rad techs. That comes out to 44 - 58 which is still well under the 176 you list. Your total hours seem to be based on 600 vehicles. Am I missing something?