Apparently my oxygen sensor has died, most likely from too much exhaust heat, so I've ordered a new sensor and a special heat-sink / bung-extender from Innovate Motorsports. My LC-1 controller still seems OK.
The sensor has been in my car for about 2-3 years since my first round of engine mods, and it did endure some very rich mixtures in the early days, and occasional tailpipe flames

so it's done well to last this long.
Apart from that, my car is still heavenly to drive.
Jay (MR2QIK) finally had a chance to do a proper photoshoot with my car today, so I'm really looking forward to seeing the photos when he gets around to uploading them.
Eric
Awesome build and awesome car, one day i Hope to have a super powerful Mr2 :P
Thanks Eric!