Getting ready for second yr on bike, noticed last yr that on the trail bike pull all gears really well except 5th. Won't rev out and seems to lug quite a bit. Haven't spent any time with anyone else on similar bike/set up to ask if it's normal or not. Running a 129 yeti. Tried a few different maps with same result. So question is if this is normal or have I got an issue somewhere? Thanks in advance