All I can imagine is either they both were nodded for power therefore they benefit from high octane, or they were meant to run high octane from the beginning and switching made an increase.
I'd get the filters since it'd still be good idea for performance, but I wouldn't bank on it completely solving your issue, but it'll help. You'll still have to fine tune your settings as you may start to lean out a bit.
Just to piggyback off of what dirt digger said; higher octane fuel doesn't increase horsepower at all. Higher octane gas may have a different quality than regular (maybe) but unless the service manual says otherwise, don't waste your money. I think the horsepower rumor came from people who NEED...
Dumped my bike a while back and I'm looking to replace the master cylinder reservoir which shattered. Anyone got a spare or know of a direct swap product please post. Whole assembly replacements are fine too. I live in Bradford Pennsylvania. Thanks in advance.