I would try Lightbulb Sun, Stupid Dream and Deadwing as it is more in the vein of In Absentia. Fear Of The Blank Planet moves more away from the heavy prog/prog metal of the previous three I mentioned but none the less an excellent album. Signify and The Sky Moves Sideways are more of a space/psych rock influenced by Pink Floyd. Both albums are excellent but it might not be to your taste Riff.
I don't think any of the other Steven Wilson projects would be to your liking.
Ill still try them anyway (gonna give Blackfield a shot), I might give No-Man another go one day.
Ill go for any that were Pink Floyd influenced as I actually have started getting into Floyds music.
Space and psych rock are something I have been experimenting with in my library, I actually enjoy the atmosphere it brings so I am prepared to try all those albums you mentioned. Cheers