Get both A phase 107mm mortars and wait to deploy them until after you see where the 88's deployed. Use the M7 DD to direct fire on the ground to panic the 88. Save points in A phase for the B phase P47 bomber to swarm him before his new B phase 88's or other AA can get setup at the front. Really all you have to do is kill both of those 88s in 10 minutes and the rest of the map should be a push over.
Also, you should be "hold fire" with your mortars or 105mm artillery until every gun is aimed and ready to fire. Releasing "hold fire" will have the artillery firing at the same time so the HE is calculated at the same time and the enemy will have less time to react. Do this and you will delete the crew weapons before he can retreat.
You should be using the same tactic with your AA as well. If you let your AA auto target and fire, it will do so at max range and often send the enemy home without a kill. If you wait for them to close the distance another 2 seconds, then release hold fire, you will drop planes from the sky. Works well with M15 AA halftrack.
you easily can kill them with m7dd just shoot 5 m in fornt of them.. and you should have enough 0.50 cal to hold the bf 109 down (I mean bantams, hellcats and co.) sure its a bit of mircro and not just q click but still cou can esaily deal with flak 36. Inf fights are much more of a problem. 16 Lw has so many cheap pios and spam inf.