I've maxed felis. I've maxed my (L) heal chip.
And when mobs drop stackables in the size of 200 peds/unit, (at 2k-4k total it means 10-20 units), you need to be among the top 10-20 shooters (counting dmg/sec) to have a a good chance for anything above 0 ped, which means you need to be using the fastest gun you have.
When gun breaks permanently though there is nothing much I can do (if I don't have enough PEDs to buy a new weapon right away). Also when PED card is empty there is nothing more that is "affordable DPS setup", what you can do is to use up the weapons you have on you hoping for that last straw.
(I do have a faster weapon in storage, but since there is no chance at all I'll get a new one, it's a X5(L) with good tiers, I won't use it as it would be used up within 10 minutes on these mobs. Oh, I forgot to mention: It's (L). It means I can't repair it when it's broken. I also got a HL12(L) in storage which I also looted a long time ago. It's TT is rather low though and it's not also repairable. I also got a rocket launcher Vrex 2000(L), but at 11 ped TT and being (L), that is it's not possible to repair, I didn't even bring it to the robots as it would be used up within minutes.)