Akras are fine with the OE pannier rails. I have that combination on mine.

Regarding fuelling, I've opted for presuming it's fine - given they're a Yamaha accessory, fitted to my bike by a Yamaha dealer (on behalf of the previous owner), then I'll be having words with someone if it eats a piston. If I was going to do any of the airbox/filter mods as well then I obviously would stick a PC on it and get it on a dyno.