I have been doing really well steadily progressing with no problems but after the last blade change I really had to struggle to get a good shave. Same brand as I have been using (Derby), prep the same, technique the same extremely bad shave with irritation. 2nd shave on same blade even worse. Really started to doubt myself. I get to the 3rd shave. As soon as I start I am getting tugging and pulling. I stopped and changed to another new blade back to smooth and easy..... It was a bad blade all along!!! What a relief I was starting to doubt myself and swapping over to the DE razor.
It's actually amazing how very few "bad" blades you get...I can't tell you the last time I got an unusable blade...Just another plus for "traditional" DE shaving if you do happen to get a bad blade it may cost you at most 50 cents unlike a bad cart...
Since I stopped using Derbys over 2 yrs ago, worked through my samplers and gravitated to 5 or so blade brands, my "bad" blade incidences have almost completely disappeared.
^That. I've even gotten a bad Feather blade. Granted, it was 1 blade out of 300, but still, it happens...