that is really A big difference
I used to cruise at 6th gear at 52mph but recently the bike felt hard and I needed to drop gear down to 5th to cruise at same speed so I noticed something is not right and that was one of biggest reason I opened up air filter+ throttle bodies etc.
i cleaned heck out out throttle bodies, sprayed a quarter of throttle body can into throttle bodies and intake, saw some particles and little oily stuff coming out. used air compressor after spraying throttle body can, repeat and put compressed air.
now it feels like sports mode again, accelerator has become way more responsive prior to clean up and yes, I can cruise as I used to.
after cleaning throttle bodies, I checked the balance and they are more than perfect.