Okay probably not the first time for this question. I currently have a compact 50, 34 and a rear cassette 12x23. In doing some long alpine days, I have noticed by the second pass my legs are pretty broken down. Cadence is quite low if it is 7%+. I am thinking of switching out the rear cassette. Any recommendations on what gearing would make sense. I have 10 speed cassette. Should I be seeking a 12x27 (if that is possible) or some other combination. I know it is somewhat personal but any help would be useful.