Yeah, that's what I'm doing. Was using the last lvl of Vet so could still get the points from Pathfinder captures and not waste defibs or medkits on my low level team. They're mid-40s now, Want to get 'em to mid-50s and then start running lethal again.
My first group, hit Lethal at mid-50s and leveled to 70 pretty quickly. Get this second group to 70 and if event still going, I'll swing back to vet again for awhile.
I've been trying to use the lower zones of Lethal to level up my cards while I have a chance. I can't get the system to give me any good cards, though.
What's your game name? Yeah, my Cobra team sucks right now. Leveling, on the 13th they would have been in the 10-20 range. I have a better team use for event boss fights.