I very much agree with you. A lot of "ambient" recordings can sound either a bit bland or kind of sickly sweet. Have you tried Atheus' Drones and Soundscapes? Or perhaps something somewhat "darker" like the work of Thomas Koener?
Have you tried Rod Modell's other old projects? Like Global Systems Silently Moving, and Electromagnetic Etheric Systems Approach? They are both in a similar vain to Waveform Transmission. Slow moving with lots of field recordings etc