I'm not familiar with Eagle
AIO wheel/tire cleaner, so I can't comment on that. I use EF HI Cleaner full strength with the Oxo tire brush. I usually give my tires a good scrubbing every other wash. I've been using Eagle One Wet
Tire Shine as a dressing.
What I've noticed is that if I don't really get in there with the scrub brush and clean out the tire, I will get some browning a few days later (depending on conditions) and/or my dressing won't hold too long.
Maybe by diluting the Eagle AIO cleaner, you're not really "deep" cleaning the tires. Possibly just cleaning the old tire dressing off. So when you apply your 303, it doesn't "soak" in. Maybe try cleaning the tires, rinse them, clean again and rinse. I do that from time to time if my tires are in rough condition. Just a thought.