I have been having the same problem for maybe a year, but it does not happen all the time. The way I can explain the problem is that it takes more force than usual to downshift from 3-2 and 2-1 and there is kind of a crunch feeling... like you stepped on an acorn on concrete. Only happens when the bike is at normal operating temperature.
I find that rev matching helps. That is when you pull the clutch and increase rpms to match what is needed in the next gear down for the speed you are going before changing gears. It doesn't always fix the problem 100% but it sure makes it better.
Here is the strange thing. Sometimes if I park the bike for 5 minutes (like to get gas or whatever) the problem goes away and may not come back for a few days. Sometimes it sticks around for a few days and then will disappear for a week. I cannot find any correlation to old or new oil, ambient temperature, type of riding, traffic conditions, or anything else except it does not have the problem when the bike and oil are cold.
This has been bugging me for a while now. If someone figure out how to fix this problem that would be awesome. Just an explanation of whatís happening would be great.
2013 Cross Country Tour: Custom paint, stage 1 exhaust, Lloydz Hi-Flow air filter, cams (HOH-VM1-DR), timing gear (HOH-PTS), Power Commander V, Auto Tune module, Gustafson flip shield, OEM passenger backrest with Cycle Ops luggage rack, Vic HID, heel shifter, Rockford amp, Infinity speakers all around.
2011 Cross Country: Burnt and Traded