The Stuka fires in a line and is easily dodged, Sturmtiger locked behind crappy doctrine, King tiger=late game and expensive, Panzer 4=weak and easily fought off with anything form of AT, Leigs do minimal model damage and require a non moving target.
Still better than Brits.
(not to mention huge potential of Stuka, doctrine with ST which is everything but not shit, PZ4 with triple armor bulletin and laser guided missles from legis. It seems like you dont want to notice it )
Get rid of snipers. Replace with JLI and Pathfinder type squadrons. Sniper meta is ResidentSleeper, and no unit has more impact on a game than a sniper.
That's the besto solution I was dreaming of for a long long time.
Get rid of them and introduce long-range support infantry with % to snipe if enemy is below X% hp.
Another issue is to fight heavy fortified postions like infamous med truck+schwerer+leigs.
They don't have mobile rocket arty.
They don't have mobile mortars.
They don't have on map arty which shoot into fog of war.
In other words, it's really hard to weaken such positions without tools other factions have.
As for the AVRE, yea, it's good but because of range, it's that useful like Sturmtiger. Plus like you mentioned, turret can be infact disadvantage sometimes.