In addition to Nacet, I have Astra SP, Gillette Platinum, BIC Chrome, KAI, Feather, Wilkinson Sword, Persona Platinum and Derby Extra.Welcome to the journal section!! I am new to this area of the forum too!
I have not tried the Blackbird myself but a lot of folks here love it. I would stick with it for a while longer. You figured out the Rockwell. I have been at this for about 2.5 years now and I think in my first 6 months, I must have tried 30 different razors.
My shaves didn't start to improve until I decided to stick with a razor for a week at time, and when I got a new razor I shaved with it exclusively for a month. I did have some uncomfortable shaves with lots of stubble patches at first but by the end of the month there was definite improvement.
What other blades do you have?
I did try it with an Astra SP yesterday.
The shave was more comfortable, was able to get closer, but still ended up with some weepers and lingering irritation.
Will try again tomorrow!