I have both of those the Knurled and the Stainless from FDV. The knurled are perfectly flat on the bottom and cover a big area. Once the coil is in place they are still too tiny for me to get my fingers on for a proper tightening, I end up using my Leatherman's needle nose pliers instead of a Phillips screwdriver.
The 12 pack of stainless are nice as the tops are machined quite well as opposed to a sloppy Phillips head on half of the clone screws. They are still not as flat on the bottom as they should be but better than most.
Knurled on my 3.1
The best solution I have found to fixing the
kayfun decks is to cut a groove next to the screw with a small file. I used a triangle file but I think a small rat tail would be better.
This way you just pull the wire around the head part way, place it into the groove and tighten.
A perfect capture every time, even with twisted or parallel.
I was told that the reason my wires didn't capture properly was that I had a clone and not an Authentic. Oh well what can you do...
The cheese head ones from
@Grendel6.5 or the Screws of destiny from
@tchavei as well as
@doofy666 and the cap screws would all perform better than the FDV ones IMHO. I have stopped using the knurled after cutting the grooves in my posts and have gone back to the regular FDV stainless.