New to engine issues and what to look for, but your compression numbers are way beyond tolerance at cyls 2 and 4…+-10. If money is tight, but you’re attached to the Kia, keep up with the appropriate levels of oil and just drive it out. At this point an additive will only prolong the healthiest part of your vehicle, but don’t be surprised if something catastrophic happens out of the blue. You could be looking at another 75k or 10k. Darn Kias. Good luck brotha.