Just something that occurred to me - do prologue missions (I do them for healing all the time) affect my mmr? Has anyone tested this at all?
No, pve is separated. Though shield training is said to count and you can tank there.
Yup - retreating in shield training totally works. I tried it this week between lightning rounds and it definitely made a Difference.
Thanks - I was more worried about upping my mmr by doing healing missions, but good to know.