The real problem is that grenadiers over perform therefore spamming grens is the most chosen option. Reduce the effectiveness of grens and you will soon see alot more PG's.
Haha watch what you say about grenadiers overperforming. You are gonna get some serious flak.
But I do agree though about grenadiers. Not sure if they are overperforming but they are very very annoying when they are blobbed and all equipped with an lmg. A lone grenadier squad or one without upgrades is fine but when they are en massed, it is crazy good