You're right it's not EDM, genre-wise. EDM is a more recent style.
Not that genre matters that much. Good music is always good music.
Steve Roach is the name of a very prolific guy who mostly does more ambient droney stuff but you might like it. He has been around for decades doing his thing and i find he gets better all the time so i would recommend some of his more recent works.
Another peripheral recommendation is weird prog rock which co-evolved with the electronic ambient music. I find that bands like Popol Vuh and Amon Düül II explore much the same territory of hypnotism as the electronic artists you mentioned. Also, Klaus Schulze is worth a mention. He was in one of the german prog bands, and then moved on to electronic music.
Other name drops just in case they haven't been mentioned yet: Mike Oldfield, Tangerine Dream, Ash Ra Tempel
Btw Future Sound of London was a great suggestion and on a similar note i suggest Global Communication with the album 76:14.
Stevie B-Zet's two albums under this name are worth checking out too: