I'm not even sure how volks should be changed at this point, have resigned to trying to outskill my opponent long enough to get double Obers and meme their inf. That or some Feuersturm smoke centric build.
Even if StGs could drop, who would ever waste a weapon slot on them? I totally understand the part where the StG upgrade comes fast and can be upgraded out of territory. However, I don't think that BARs making Volks completely obsolete and forcing LMG Obers is a good design. I'm not calling for a big buff, either the StG upgrade doesn't take up both slots so Volks can pick up dropped weapons, or rework their veterancy bonuses a little.
Assuming one BAR inf -
Don't take this the wrong way but
camp behind sandbags and other cover. If we're talking strictly rifle vs volks, being kicked out of cover by flame nades more than negates their firepower advantage as that cover remains denied for a fair while too. Even if you eat a nade in heavy cover their men are going to get shredded on approach too.
Obviously squad vs squad alone is pretty rare and combined arms will decide things big time. Like a certain Auf J shrugging off zooks....
As an aside, DevM recently uploaded a OKW vs UKF matchup, take a look at that for some pre-upgrade fight stuff.