The last gren discussion has faded too far, so I'm making another.
Grens scale the worst of all mainline infantry. In general, EFA veterancy tends to be worse than WFA, however with cons having just been reworked (including a vet 1 RA modifier which is rare) I think grens needed a little more than a pop cost change.
I would give them some kind of explosive resistance at vet 2 or 3, since they are the only mainline stuck at 4 models, and I would split their vet 3 RA bonus into 2 smaller ones (same net total) for the same reason. I think increasing their offensive power in any way is a mistake, as DPS has never been the grens problem. Surviving long enough to use that dps, especially as a mostly stationary squad, is the problem.