Yep always premium and the K&N actually came with the tune from Ford.Does the tune require premium fuel? Have you used premium fuel with every fill up since the tune was installed?
Is the tune something like this with 45hp/60ftlbs https://performanceparts.ford.com/part/M-9603-REB
No fan of rock catcher air filters... I know there are freer flowing dry panel air filter options. Have you serviced the K&N at all? I'd consider the AFE or AEM dry filters since they don't require oil, and easier to service more often. And, they might just catch a little more dirt too. The other option is a noisemaker free flow pod filter/tube kit. Pretty sure Injen, AFE, Mishimoto.... have options with non-oiled pod filters. If you believe you must use an oil'd filter, pretty sure the AFE 5r multi-layered oil filter, IMO, does better than K&N, based on what I've seen downstream of these filters when I've used them.
IMHO, I see too many with modded/tuned vehicles blindly using the recommend intervals/viscosity which is foolish. And, across too many makes/models, I find it all too common. Owners add a turbo or supercharger, or crank the boost up on the factory turbo or supercharger, and then continue following the owner's manual like they're running stock. Makes no sense.
If the engine is GDI only, have you performed any GDI valve cleanings?
So, without any data other than the UOA, I'd recommend either a shorter oil change interval or thicker oil. My vote is for ANY 0w40 oil. Last time I went parts shopping, Valvoline, Mobil1, Castrol, Rotella T6 were locally available. I think M1 0w40 wins 1st prize with 'pricing' from Walmart when available. Another option are the 3.5+ HTHS 30 grade euro/hdeo oils.
Concerning the oil filter, since engine is making more power and torque, burning more fuel to do so, producing more soot, I'd consider an oversized filter option if there is room. You'll have to check for clearance. FL910s is shorter than the FL400s. Its an easy way to get some more media for that 10k interval. So, consider buying an FL400s for a test fit, and a trial run for 10k.
I hadn’t considered a bigger filter. It doesn’t really seem necessary though since my UOA don’t seem to indicate the bypass valve is activity and filters bypassed.