You found my least favorite of the blades (Merkurs) right away. To me it doesn't matter what you try next...that's the fun of the sample pack. Obviously you're getting good "feedback" from each of the blades you try, and you're developing a hierarchy of what works.
You describe the blades in good terms...relative to what many of us have experienced-- and if you can notice these attributes and jot some of them down as you go, a favorite or "go-to" blade will come to the fore.
The same with the razor. Just take your time and keep track of what your face tells you.
One aspect you didn't mention was PREP. In my book, after a few decades of DE shaving, if I had to skimp on one area (timewise) I'd skip 2 passes out of 4 and still do a decent prep. If I want to guarantee an uncomfortable tugging, pulling shave with the best razor, best soap, best blade possible, I can skimp on the prep. On the other hand, if I have a 99 cent puck of Williams, a "middle-of-the-road" blade from Walgreens, and I still want a comfortable shave, I give it the entire "go" from the Prep side of it.
Prep is "IT" for me.
I use Kyle's pre-shave prep...exactly as spelled out on his fine post. I would challenge you to be open-minded and try this for 10 days and see how it affects your shaves.
You might have $400.00 worth of shave prep goodies, and you might spend 12 hours in the shower, under steaming hot water, with special Mongolian Mud smeared on your face and dung from Albanian Goat Herds rubbed on as a final step, before putting on your Prorasso...but IMHO it doesn't amount to anything compared to Kyle's Prep. Try it.
"I'd wish you good luck, but the good ones don't need it and all the luck in the world won't help the bad ones."