If conscripts get a 7 entities I would suggest grenadiers get a similar upgrade with BP3 to 5 with the same rules applying.
You have veteran squad leader upgrade already in game.
Theoretically, if we put in a cover bonus, would people prefer offence over defense? And what bonus as Conscripts already get quite a bit of accuracy with veterancy.
Offense, it reinforces defensive role in early game and allows them to do something else then wait for AoE weapon to blow them up in late game, when all the map is yellow cover and variety of heavier vehicles is on field.
Cons don't lack in durability, but strong shield is completely useless if its incapable of any kind of bite, so additional accuracy(or anything that would benefit their DPS in late game environment). It doesn't matter much that I can get fresh cons to vet3 faster, when there is no reason to have them on field again once wiped over more penals or guards who actually do inflict ever so important attrition.
While cons get plenty of accuracy with vet, keep in mind that high bonuses to low values still end up in low values and cons vs LMG grens are perfect example here.
50% accuracy bonus to ~6(7 with additional man) DPS cons have at long range doesn't add much compared to 40% grens get go their ~15 DPS with lmg and while I'm considering extreme of max range here, it doesn't get much better for cons with lower ranges and you should see what I mean by now.