I've used Auto-RX successfully as well, but I had realistic expectations and didn't have disaster scenarios. I also used just Auto-RX during the Auto-RX regime, I didn't create a chemical mix that would probably/potentially skew the results. And also, all our driving is ideal conditions for Auto-RX (greater than 20 minute trips for the most part, so the oil does get nice and hot).
All that being said, and as cheap as they are, to start, I'd pick up a new OEM (not aftermarket) PCV valve, to ensure that the PCV system is operating properly.
If you're anal like me, I'd do a UOA on oil at least with 1000 miles on it, to ensure you don't have any coolant leak...Auto-RX will expend "energy" on fighting the coolant rather than expend full "energy" on cleaning/lubricating. If you have no Potassium, then you should be good (unless somethings changed in oils and/or coolant since I last read, could be, never know).
Pick a nice simple cheap AutoZone dino that is the thinnest spec'd for your engine. Using as thin of an oil possible allows the Auto-RX to get as far into things as possible. Using a thick oil will not allow it to get behind seals and whatnot. Resist the temptation to make an oil "brew", that's not going to help anything; unless you have a specific well thought out reason, such as a known viscosity target.
Auto-RX likes heat. It takes about 20 minutes of engine operation before the oil is up to temp. Higher heat, and higher flow, areas will see any potential benefits faster than lower heat and/or lower flow areas. If you do frequent trips > 20 minutes, then you're going to get better results than if you drive 1 mile to work and back each day and that's it. This is where the phrase 'Auto-RX works if you work it' comes from.
What I've always done after the Auto-RX clean and rinse phase, after the last rinse phase is over, I drive another 3k miles with a good dino (known not to have any PAO and/or esters), so as to ensure all seals are back to normal. Then I go back to my synthetic fill.
Use good oil filters. Motorcraft or NAPA Gold/Wix. As cheap as they are, and as quality as they are, there's really no reason not to.
Those would be my suggestions...
Chuck