Since the anti-aircraft gun has ceased to be an effective anti-personnel weapon, i can suggest the following changes for the engineers
Machineguns and anti-personnel stuff for engineers 1 (for example)
Moscow: Give them an ampulomets from donateStalingrad
Berlin: Engineers 1 will have Maxim vs MG08 and engineers 2 will have SG-43 and MG-42
Normandy: Browning M1917 or Vickers MG for allies and MG08 for axis
Tunisia: Browning M1917 or Vickers MG for allies and MG08, Schwarzlose M07/12 or Fiat-Revelli M1914 for axis
Pacific: Browning M1917 for allies and Hotchkiss Type 38 for axis
Engineers 1 will get worse machine guns, but at least they will (except for soviet campaigns)
AA Guns:
Firstly you need to remove overheating if you’re giving them such an angle
Engineers 1 gets fast-firing small caliber AA-guns (most of them 4 times weaker than the current ones, since they have 1 barrel)
Moscow/Stalingrad/Berlin: 25mm 72-K vs 20mm Flak-30
Normandy: 40mm Bofors L60 vs 37mm Flak-43
Tunisia: 20mm Oerlikon vs 20mm Breda 20/65 mod. 1935
Pacific: 20mm Oerlikon vs 20mm Type 98
Engineers 2 gets the large-calibre AA-guns with radio fuse (i hope the radiomen’s carpet bombing will be available for each campaign in the game)
Moscow/Berlin/Stalingrad: 85mm 52-K vs 88mm FlaK 18
Normandy: 90mm M1/M2/M3 vs 88mm FlaK 18
Tunisia: 75mm Vickers 1936/39 vs Canone da 75/46 C.A. modello 34
Pacific: 3inch M3 vs 75mm Type 98
AT-Guns:
Engineers 1 will get weaker guns, allowing them to fight the early tanks of the campaign (and i hope for some kind of matchmaking)
Moscow: 37mm 1-K vs KPUV vz.38 A.K.A. 4,7cm PaK(t)
30$grad: 45mm M-42 vs 50mm PaK38
Berlin: 76,2mm ZiS-3 vs 75mm PaK40
Normandy: 57mm M1 vs 50mm PaK38
Tunisia: 40mm QF 2pdr vs 37mm canone da 37/45 A.K.A. PaK36
Pacific: 37mm M3 vs 47mm Type 1
Engineers 2 will get more powerful guns capable of hitting almost all tanks in their campaign in frontal projection
Moscow: 45mm 53-K vs 50mm PaK38 (what we already have at the moment)
PayStalingrad: 76,2mm ZiS-3 vs 75mm PaK40
Berlin: 100mm BS-3 vs 88mm PaK-43
Normandy: 76,2mm 17pdr vs 75mm PaK40
Tunisia: 76,2mm M5 OR 57mm M1 vs 75mm Canone da 75/32 modello 37
Pacific: 57mm M1 vs 75mm Type 41
this list of weapons is given as an example, if you have any questions, wishes, additions - welcome to the comments