That’s too complicated.
SBRs do 3 to 4 IPC damage and if an AA gun is present, the attacker takes 2 to 3 IPC in damage in return. It’s simple, easy to remember and does not need to be calculated based on territory value. After all, we’re talking the AVERAGE result, not the average based on property value and day of the week. Obviously if the territory is only worth 2 IPC, then you can only do 2 IPC in damage maximum.
Likewise, I don’t know how they get 45 IPC for a technology. LL rules stipulate that if you attack with 6 infantry, then you get 1 hit no matter what. Likewise, if you roll 6 dice for one technology, you should get one hit, no matter what. 6 Dice cost 36 IPC.
As for Fighters/Bombers, that’s pretty easy too. Roll for the fighters, then roll for the bombers. If Germany attacks Russia with 7 Fighters, 2 Bombers, then Russia kills 1 fighter for sure, and rolls a single AA shot @ 1 for the remaining fighter, then rolls a single AA shot @ 2 to see if a bomber is hit.
Since in Revised, AA Guns are targeting fighters in one group and bombers in another.