I think they need less spread, and either a faster rate of fire, or fire more shells per barrage. While you're fixing the wehrmacht's artillery gun, you might as well fix the soviet's as well.
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I would say there needs to be a 15-25 muni non-snaring panzerfaust variant that hits like a panzerschreck, unlocked when one truck is down.
When two trucks are down, a 180 muni 2 panzerschreck upgrade for volks.
Investing munitions in early fausts would delay reliable and cost efficient schrecks. It's easy for light vehicles to be overwhelmed by multiple schrecks, but they still have a chance against fausts.
If an allied player doesn't press OKW to use fausts enough with their light vehicles early on, they suffer the wrath of a dedicated AT squad.
Currently, being able to spread schrecks out across multiple 5 man squads keeps schrecks in relative safety. Five man squads are much harder to wipe than 4 man squads, and purchasing schrecks at 90 muni intervals allows for steady production of handheld AT while still maintaining AI strength. It's also to drop schrecks on the field, as the likelihood that the model holding a schreck dies is less compared to squads holding two.
Make the volk's combat package (schrecks) available after you purchase an upgrade from the med hq for 250 mp & 20 fuel (kind of like soviet AT package), then make the combat package (schrecks) itself cost 100 muni instead of 90 muni. It would make the OKW have to invest more into their schreck blobs of doom, instead of getting rid of it entirely.