Ok ripped more cds last few nights and have a few more suggestions...
Some you may know, some might be 'left of field style' than your list above, & some are exactly on the OP's 'looking for' tip.
Baluns Records (Swedish label run by Son Kite) Check v.a-Otherwise & Pope of Gegga album
Quarz - S02 (pumping minimal german style?!)
Bandit - Looking for the Element (Israeli artist with Atmos/Scando influence... 2-3 good tracks on this one)
Aeon Records - v.a Refresh
Lish - Dejavoodoo (first album... more pounding & minimal & less progressive than what he became)
Candyflip records (v.a Candy (Igneous Sauria influences throughout), Drone- Drastic Plastic CD-EP, Phacelift-Path of Pathos)
Electro Psychedelic Trance vol.2 (old POF comp with one of all timefave minimal tracks - Moksha-Iteration rmx)
D.I.M.O - self titled album... good stuff here & still sounds fresh
Metal Spark - Corrosive ( metallic)... also check Sibilant - Proper Filth (same artist)... minimal 4x4 break trance
Digital Structures Label - Early releases 2000-02 are techy/deeper/minimal & less housy... also heaps of obscure vinyl eps worth chasing down
Flow Records - Early v.a's like Change, Flowin, Filtered Beats, Non Toxic Frequencies, Blue & Motion Generator
Groove Zone Records - Magnetic Storm v.a (only comp from this label to go in this direction)
v.a - Progress Chapter one (froggle records)
Cybersnack - rebels from the Source (older 99' release that has some good chill and slower 4x4 minimal)
Flying Rhino - 3rd Flight through to 8th Flight compils
Igneous - Skip Insect (more banging version of Igneous Sauria, though nothing will beat the first I.S. album on Creamcrop)
Three Point Turn - By any Meeans Necessary (hard groovy music... hard to describe also)
Interzone Records - Interzone 1 & 2 comps (first is very minimal indeed)
Innersound Records - Perfect Evolution compil (similar to Undefined Emotional Freqs style)
Behind Blue Eyes - CPH (first cd only.... good Beat Bizarre style and what Iboga records should have stuck at to keep my business)
Manta Records - One Point Perspective (good NZ comp.... the second one 'Subduction' is pretty good also)
Disko Slickers - Slick of it all (album by the guys from Intact Instinct in a similar style)
Nerve - No Foco (rare & very good cd ep from the guys from M.O.S... deep & rocking)
Cosmopolite - The Second Step (Israeli compil with great tracks from Bitmonx & Dooper Doopler)
Stiimulus Vol.1 (first v.a from Nervine recs... only one in this minimal style)
Shaman - Foretaste (Plusquam recs... has some good deep scando trance onthis one)
Charasmatix - Abracadabra (heavy minimal and pounding but in a good way... first track kills & prefer to Soma Agents)
You already have some of my favorites listed like Zerotonine, Igneous Sauria, Haldolium-Deagua era, XV Kilist (early singles 100%!)
There is still more but I think that should be enough to offer a load of tangents to go off into, and i get tired of using keyboards that don't have black keys :-)
Quick O.T rant - I looked on Ektoplazm.com recently and was shocked to see a style called 'Zenonesque'... this style was around for years before Tim started his label in various forms.
Originators would be X-Dream, Tarsis, Moksha, Planet B.E.N, Atmos, Reefer Decree, Der Dritte Raum etc... labels like Spiral Trax (Progress in Trance), Flying Rhino (3rd Flight), Iboga (Ethnobotany) & Creamcrop. Full props to Zenon for their dedication & prolific releases but I guess I like seeing credit go where credit is due.
Peace!