The videos people "fixing" cars with the mechanic in a bottle make for good YouTube content, but I bet for every 500 people who attempt, only one is successful. You're likely in that 499.
Look at your opportunity cost.
You're burning 1 quart per week based on your mileage.
Right now, you're burning $6 a week in VRP.
With HPL you'd burn $11/week.
With random Kirkland / Supertech: $3.40 a week.
Start throwing engine flushes in there, fuel system additives, then the time invested in this for no outcomes, it's not looking like this is a good use of money. Like was mentioned above, a borescope to inspect for cylinder wall damage or valve damage is the best investment before burning your money. I just looked on the Kia forums. These dudes are throwing everything imaginable at the engine in the hopes of fixing oil leaks.
If trying all these soaks, flushes, gasket replacements and such like is suggested on the Kia / Hyundai forums results on a lot of down time for you, that's a cost to figure too. Then there's the risks. Guys will clean a throttle body valve because they think they need to, end up damaging it, and having to pay a few hundred to replace a part that was working fine. Bolts break, spark plugs break, repairs get done incorrectly, things fall into the cylinder unnoticed, mistakes happen. Now you don't only have an oil burner car, you have an oil burner car with a little piece of ceramic that fell into the cylinder and thrashed your engine.