I only have 2 problems with howitzer balance.
1: Jeager Armor. The elephant requires arty to counter, and the same doctrine has recon+bomb.
2: Luftwaffe support. The fuel>ammo ability, in combination with a cheap recon and a bombstrike, make it way too easy to take out howitzers. For only 50 fuel and 40 ammo, you can take out a howitzer.
Yes number 1 is a big problem because the correct counter is already hard countered.
Number 2 not so bad seen as an air support doctrine is a perfect doctrine to counter static defences just like real life. Having a doc hard counter a other is ok. So long as there are docs which hard counter the air support. It's only like coh1 in that respect.
Having howies survive arty strikes with 5% HP is a really cool idea. Would really increase play around them, both attacking and defending, would be more like the play around a pak43 is now.
On a side note, there are certainly times I've noticed at the end of a game that a perfect counter to what my enemy had would have been a howie and that they had the incorrect doc for countering it. So maybe a clever player would bait people into certain docs, to then counter with a howie.. Kinda like coh1 Germans doing T3 terror fakie, but then going T2 defensive.

Charlie Dont Surf