Thanks to all for the replies. I use the grid hotkey setup but how do you use your control groups? This is something I am not familiar with this. Also I try to play all the factions and I only play 1v1.
Well, for control groups you simply select a unit, hold control, and then press a number key. I usually organize the unit list in the upper right by engineer (1), infantry (2-5), Sniper (5), MG (6), armor (6-8), artillery (0).
I never use nine for some reason. I prefer keeping my infantry squads on individual control groups and double up the same type of armor (P4, Comet, Panther) on 6 or 7.
For me, it helps because I am used to the same general layout of the upper right, and if I hear "ahh mines" from my rifles, I can look up on the right and see who is in combat or who is losing models and just hit the unit icon and press r and make them retreat immediately. Also, if I see a unit is on low health or models, I can just click in the upper right and press R. The control groups help because I have the unit icons laid out how they usually appear to me.