I used to go through a lot of repair kits for tracks until I decided to just wait for the autofix and take a few shots, because yeah the ammo rack needs some serious love.
When possible, I try to get stacked around a corner. tank in front of me, pop out with the lead tank, wait for his shot and reverse, That seems to work pretty well as long as there is no dawdling out there.
I don't recall what my crews training is on. that would be a good one to do and maybe do the wet ammo rack or whatever it's called.
losing half hitpoints on one shot sucks