Thread: Need help honing my Filly

My vote goes for not well established bevel.

I am sure the problem is not the stone if it is properly lapped and prepared for use.

I could not catch from the post if the Fili was bevel set by a honemeister, but it is possible the bevel is not there yet, especially if you started with tape and then removed it.
Tape is personal thing but there is no difference between tape or no tape for the final result, so removing it did not increase your chance for better edge, however it is possible you have not gotten the bevel reset and there lies your problem.
If this is the case you need to spend some more time on the 4k , a means of looking at the bevels like a scope or loupe, will be greatly helpful in diagnosing the problem.