Calliope needs to come down to katy lvl in terms of lethality. The high price will then be for its survivability.
Pwerfer needs to come down to katy lvl in terms of lethality. Ost tier 4 pricing still needs to be looked at, stupidly high tech cost is no excuse for an overperforming unit (especially in 2v2 and up).
Stuka and katy is fine. Situational units, as they should be.
Static artillery pieces should only be decrewed by offmap artillery (e.g. stuka dive bomb, IL2 50kg) while retaining a little health on the piece. Minimal amount of effort to completely destroy it is at least better than it is now.
I believe B-4 will always be either under- or overperforming, too much punch in that unit. I don't like it at all.
UKF needs to get some offmaps tweaked (nerfed..) while sexton needs a serious buff. Base artillery...meh, I don't get that design at all.
I have no opinions when it comes to USF artillery except calliope.
IMO