If I were to select three proto-proto techstep/neuro tunes they would probably be as follows:
Sound Corp - Regen Time (part 2/sequel remix) 1992
This is very much gloomy darkside, still very nut-e, but more in the sense of the rave coughed and spat out. or an awol tape pack becoming sentient and taking lsd. You decide. Nothing like it and I don't think there ever will be in the future. Huge psychodelic space arena vibe to it as well, which you only really get with Acardipaine's works from this era.
DJ Fokus - Chill out (1993)
Stalkerish darkside, harkening back to Nebula II from a year ago, but more fixated, more militant and with a huge proto-reece bass drop. ardkore souljas hands cocked into pistols, etc. The vocoded chill out voice quite disconcerting. Very much sewage and slime. A multifaceted tune for sure, I don't want to call it 'art' but you know, mindblowing.
Vinyl Conflicts Own - deathrow (1994)
Released on the finsbury park boys Krome and Times' Tearin' vinyl, the rhizomatic Can meets Jah Shaka avant guttersnipe funk convergence you were always waiting for. Huge reverbed, flanged hall of mirror drums with a bassline that is curiously utilitarian as opposed to overtly tuneful in its execution.