2 ISGs is the easiest way to do prolonged damaged to emplacements. Never fire stukas on emplacements save them for the nearby support weapons. LEFH18 will make short work of them. I recommend counter battery if a mortar is in the area. Use JPIV attack ground. Last but not least...1. force emplacements to brace with indirect fire. 2. When over, use flares or recon. 3. Next, drop sector artillery. Goodbye sim city!
It has already been said but the primary option is a Scavenge doc Ostwind. If you go mech build, then you need to rely on med kits and go Schwerer. Going backward to Battlegroup is asking for a comeback by op.
The only other real option is going heavy on mech with 2 luchs and stuka (against AT guns) or puma (against light vehicles) and playing for Command Panther. The Command Panther really shines with a heavy mech build since its vet buffs near by vehicles. Its mark target ability can easily take down call-ins like Pershing or IS2 if you have a puma in support.
Mortar HT would be redundant. The flak HT just needs a reduction in its fuel cost to 35. The ISG could also use a reduction in MP to 310. OKW already has smoke on fallschirmjäger & Obers. I would like to see the smoke replace the stun grenade on Strums at a lower vet level though.