Panzer IV + 2x Double Shrek storms aboard an HT.
One of the best tanks in the game and the best AT in the game, combined. In one starting callin. It made me feel good.
With blitz I do something similar - your 4 schrecks is too much for me tho.
This is my favorite start call-in, all round excellentness, been using it for a long time now.
P4 - Repair, MG, Skirts
Storm -
1xMP44, MedKit, Bundle (get 2 Bundle nades at vet 2) - cloak & scout all the time, when you attack, throw bundle, heal and rape with mp44 = you win without loosing any units most of the time.
Storm -
2xSchrecks, Medkit
HT with Repair - keep schreck storms in HT at all times unless I need them, stay inside HT for protection, only unload if needed, cap sectors, use HT to block vehicles, use MGs on it for anti inf, get in HT during schreck reload, etc.
If HT doesnt work out for you, try using a bike instead for better scouting, works really good aswell. Downside is the lack of mobility which I prefer, unless you have some kind of sprint bonus from the doctrine unlock, but even then I prefer the HT, 2x schrecks is pretty high risk, cant afford to loose them so having a HT for protection is really usefull.