I printed quite a few times with corkfill, no issues at all but yes .6 nozzle is mandatory (i'll never print wood filled filaments with a .4 nozzle, i still remember that clog i had on the UM2 original nozzle!).
Basic settings for PLA should work, 210 - 215°c, 30mm/s - 50mm/s, as long as you use a bigger nozzle it should work.
Love the chocolate look of corkfill by the way
for the fiber filled filaments, go for the 0.6 nozzle with the Olsson block and the settings you already have. Did they mention a flow of 105%?
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