The pack was good at smashing garrison before the nerf. Unfortunately the drop in dps make it weak against garrison, and the suppression effect is completely useless against garrisoned infantry.
The pack howitzer doesn't need the suppression in the first place. The LeiG get suppression because the Okw lack a non-doc mg. The USF have the .50cal.
The pack howitzer should had its suppression effect removed, but its reload and AOE unchanged. Right now it's kind of crap against garrison, leaving the USF without a long range garrison buster.
I suggest the tier zero mortar solely for quickly getting garrisoned HMGs to piss off from important cutoffs. I'd say the stage of going Captain comfortably is a point where your munitions and fuel will give you access to some sort of tool to coax HMGs out of buildings, be it light vehicle, grenades or Pack Howi - so I'm just concerned with before that, when a player will be lacking munitions or fuel to get these things yet an HMG can still be camping a building on their cutoff.