Then you don't really know what's up here. Autofire is always always always a much bigger issue with hitting infantry than barrages are because it takes zero input given that it's in range and is a lot more accurate than a barrage for hitting individual squads. Barrages have never been the issue with indirect, it's always been autofire. Personally, I'd like to see all autofire nerfed across the board and barrages buffed somehow (maybe RoF) excluding scott because it's supposed to be long range fragile mini-brummbar (so autofire is it's main function).
Also I don't recall pack howie getting a damage bonus at vet3. You might be thinking of the 3 shell HEAT barrage at vet2.
Yea its probably the HEAT barrage, iirc it does give a damage bonus. I know autofire is what everyone hates but this is just my opinion on how the pak howie can be changed to provide more leeway for axis players to get around it, I proposed changes to barrage because you would rarely if ever see a pak howie autofiring into someone's base, meanwhile I've had multiple games already where I get white phos and heat shells dropped in my base. Back on topic, other than a 380 MP investment, the opportunity cost of the pak howie is almost 0, you are neither giving up the chance to get a vehicle nor anti-tank capabilities. (Captain unlock comes with aa truck and AT gun.) Not to mention it costs 100 muni to get a double zook RE to ward off any scout car/ flame HT dives. It's easy to turtle for a few minutes to get it out and bam you're back on course with map control because any fights you take against infantry in cover is almost instant win.
I mean there are a lot of other indirect ways to fix this other than nerfing the pack howitzer directly.
E.g. Buff Ost healing so that aoe damage affects them lesser letting inf squads get back out on the field faster (change healing to aura) LOL JK DONT KILL ME PLEASE