Here some notes about your scenario by only looking in the editor, Bru-style:
#1: Initial German Defense: Defend Hex 3 without pos.
You haven’t even set a defended hex, so this is rather not working correctly. I highly recommend Local Defense 0 as default idle-behavior.
#2: German Static Defense: Static Defense
Static Defense is for the reason bad that units can be pushed around and won’t even bother to recapture flags/supply next to them. A very bad behaviour that should also be replaced by Local Defense 0.
#3: Air Harrasment: Air Seek & Destroy 999/50 with several target definitions
Generally, I wouldn’t put bombers and fighters into the same group as fighters usually suck versus heavily armoured units anyway.
Fighters should rather only pick soft targets, tactical bombers more or less all targets, while strategic bombers stick to structures, infantry (sometimes on settlements with supply to reduce), and the pesky artillery of course, besides vulnerable transports.
You also need to be careful with Air S&D, as more than 3 aircraft in the same group will unnecessarily slow down AI processing time. If you want many aircraft in the air then try using Air Patrol which works on (allied) sight and move-range along patrol routes.
#5: Aprilia Counterattack: S&D 20/75 with 17 units.
This still looks somewhat too many units in the same group, especially with all the many spawns later.
I highly recommend having a more or less historical organisation with units that you can easily put together into the same AI group.
This way, you also make sure that these units perform much better coordinated, especially if you add something like one towed at-gun and one inf-gun to each infantry regiment of like 3 inf-units (battalions). With such separated groups, you can also easily order each of them around the map if necessary.
Later, you can copy such divisional/regimental style into all scenarios you create and don’t have to worry that much about unit balance anymore.
It’s quite fun to make up such organisations with the game’s units and should speed-up scenario creation after a while.
I also started to play with my core units according to such organization levels what is less chaotic and less unfair compared to picking only the best stuff en masse. It’s in my opinion more enjoyable.
This is the possibly the best organization overview for all WW2 nations:
http://niehorster.org/000_admin/000oob.htm
I was never really the hardcore wargamer, but even I slowly learn all the symbols.
Triggers:
Cisterna Defense
I don’t understand these triggers there. You check for a single hex ownership by Team 1 which is the US-player and let a bunch of German units spawn right from start. Maybe your intention is to capture these hexes for Germans, so they receive later reinforcements or is a check-turn missing to bolster the German offensive if these hexes are still in allied posession?
Generally, don’t place and spawn towed units without transports! No single towed unit is ever organised in an army without transport, often horse-drawn for many armies at this time, no matter how well you can push around it. No transports are only plausible in a short-of-supply situation like a long-lasting encirclement or an end-war situation for the loser as desperate defenses.
Victory Criteria
You check for turn 33 but the scenario limit is only 30?
You also often check for specific non-flagged hexes. This is rather difficult for players to remember. I suggest you rather give all important places a flag and a name, even if it’s only Hill 123.
Rail Gun(s)
Reposition Units is an effect for randomizing unit positions on scenario start. This is not meant for teleporting units around, but hey, who knows that secret science is involved in a fictional scenario?
You can use simple Move to Hex for rail-units to change positions.
Air War
Two German aircraft spawns have no AI team set yet.
