Probably much has to do with your latter point, OP. OKW units aren't the same as Ostheer units in their use and timing. Getting used to how and when you should retreat a volks as opposed to grens (or cons or whatever) can take a bit of getting used to.
For instance a 2 man volks squad is easier to kill than a 2 man gren squad. Adjusting your timing to retreat is necessary and improves with practice.
