I switch between a Merkur 34C and a Gillette Slim Adjustable, I use either an Astra SP blade or a Voskhod blade most of the time.
As for soap and preshave, I always do a good hot towel before I shave, and use Musgo Preshave soap or Proraso preshave cream. I use Tabac, Proraso and TOBS as my daily driver soaps.
I always try to shave with a very soft touch, and I use no pressure at all.
I have mapped my grain, and I know how to tackle every area, and I get very close and comfortable all over except for my lower neck.
I can go against the grain on my lower neck as I said, and get it very close, but it alwats results in a few weepers and a bit of redness.
I just can't see what is wrong, is my lower neck skin too sensitive? I really can't live with having so much stubble on my neck, my shaves neve feel "great" because it feels like I forgot to shave my lower neck.