Hi there, I probably already know the answer to this, but if you have had your armo(u)r infused, and you want to upgrade the armour to a higher level (read more flashy), that would need re-running the mission again, correct??
Well you do not really have to infuse the armor unless you are facing Mursat.
If you are done the game with your toon and know that you will never face Mursat for a while then you can put the infusing run on hold.
Also, there are more areas to get infused.
1- The Ice Caves mission
2- The Sear at the end of Miniral Springs (where the IDS drops)
3- Every Fire Island mission has a Sear there that you can use to infuse your armor.