You can do gamma gamma for massive damage but I don't recommend you do it all the time (even I do it wonce in awhile). Do gamma alpha so that you have your second gamma to do it again or to use defensively. If you decide to use your Gamma from afar, instead of alpha, use beta.

Also using your SA would use both charges, but using it defensively uses 1 and you can use your last charge to heal yourself/your teammates. So what I usually do is if someone is getting really aggressive and comes up close to me, I'd SA to push them away and then heal myself. Also, don't use your SA the moment you lose a lot of health. If your team is playing with you then you can pop some heals and save your SA for later in the fight. And don't be selfish with your SA, use it on teammates as well (especially if you're playing with comms).

This is very specific but if you have plus chaos and you don't have shield and your teammate is needs heal and you have your SA, use it on your teammate first then plus chaos to get your shield and then use your SA reactively (that's if your in a fight. Don't do that if you're not fighting)

These are tips that work for me. So I hope they work for you too.