So I got some strange shifting issues with my 105 road shifters (ST-R7020) combined with GRX derailleur (RD-RX812). The cassette is deore CS-M5100-11
Now in theory, and according to Shimano's compatibility chart this should be compatible configuration, despite a little mix-and-match
https://productinfo.shimano.com/en/compatibility/C-454
Now the problems I have screams still for compatibility issues with slightly wrong pull ratios
Going from smallest cog to largest, the first 4 cogs are shifting perfectly. Then the next couple clicks want to over shift and skip cogs, and the largest 3 are shifting perfectly again. In total it takes 9 clicks to go through the 11sp cassette. What fucks my mind over, is the top and bottom cogs that shift perfectly, if the pull ratio was wrong, these would have equal problems?
Argh, i feel like I should have gone with the simpler 9 or 10 speed systems >.<