Righto.
I use two mirrors for this (I have a couple of moles on the back of my neck I need to be rather careful around) so I prefer somewhat milder razors for this, as my fine motor skills aren't that great in combination with the mirrors.
So far, the ones I liked there were:
- Start 0.90 OC
- Gillette Old
- Gillette New SC
- Gillette Tech
- Karve OC plate F with Yaqi Knight Helmet top cap
- RazoRock Mamba (both 53 and 70)
- RazoRock Lupo (the aluminium one and the steel dual comb head)
- Supply Provision injector
- Occam's razor (this one:
https://www.classicshaving.com/products/occams-razor)
- Colibri 1.30 mm OC head
- Colibri 1.50 mm SB plate with the PAA Meta-4 top cap
- Gillette Mach 3 Turbo
- Phoenix Artisan Accoutrements Ascension
Open combs and large gap SB razors worked the best for me.
Of all of those, I think I liked the Karve OC plate F with Yaqi Knight Helmet top cap the most so far. I could hardly feel the blade, but it did the job admirably.
EDIT: The Phoenix Artisan Accoutrements Ascension was one I forgot that was about on par with the (Karve F-OC plate + Yaqi Knight Helmer top cap) combination.