If you just started playing when Badzones were giving so many creds that's a problem cause you couldn't compare with previous values, so it's understandable that you thought that was the way it worked.I only really started playing a month or so ago, so didn't really know the badzones & typical payouts before the bug, which I also then recruited & outfitted a specialist team for.
Only advice I can give you here is taking a look at this post that has some useful tips: https://forums.legendary-games.com/index.php?threads/beginners-guide.7724/
So far what has worked best for me is having kept my squad values low. I use master crafted weapons and grapnels/scopes/strip kits but only for those gangers that really need them, I have one unarmed guy with order, and try not to give any backup weapons and getting just skills that are totally needed or don't increase the ganger value.
With that kind of deployments I've kept my upkeep low (for example my Van Saars are under 1K creds) and seldom have any ganger injured after battle, so even with the badzones nerf I get 4-4.5K creds each turf run (with 4-5 level assets)