Hi Gene. If the tires rated at 44psi, try a bit more, say 48 or 50. If tires and all else in Ok shape, see how it drives. Did you do the proper ECU re-learn procedure for the Kia?
I do it automatically on every one.
It's like making a nice dinner- the Groove is the main course. Tire pressure, O2's, PCV re-routing, IAC mods, MPG Remedy, any needed ignition work, RVS treatment of engine/drivetrain--
These are the rest of the meal! As long as there aren't ECU or sensor issues, or vacuum leaks, or any other things detracting from mechanical worthiness,
and your Groove is good--
then gains are all but certain to follow, in my experience so far. There ARE stubborn difficult ones out there of course. Some Grooved vehicles "taste great" right away, others need some more "sauce" to be tasty. And some need more time to adapt, sometimes several tanks of dinosaur juice.
I've found that during the re-learn drive sequence, I can usually feel the added low-speed/RPM torque just off idle. That and doing a pre-post Groove sniff test of tailpipe is another telltale indicator. I tell folks the Groove gives a combo. of added low speed power, a cleaner tailpipe and better economy. But we don't usually know up front the proportions of these benefits.
To finish this paraphrase of the Gadgetman Groove--so you Grooved the Kia and it's like you grilled a burger. You can just eat the plain burger, or add steak sauce and the "rest of the meal" and see how nice a dinner you can make!
and yes those pics of your Groove jobs would help us all to help you Gene! This is fascinating stuff to learn, and it never ends!
Tracy G
Tracy G