Spent about three hours quality time with the Miata this morning. Pulled the 'charger so I could access the O2 sensor plug (I have now moved that so it is accessible at all times), removed the O2 sensor for the wideband and calibrated same. Shimmed the 'charger nose out with an additional two washers to see if that will finally let the belt track straight. Finally, identified my slight coolant leak as coming from the thermostat cover on the reroute spacer, so pulled that off, cleaned it up, made a new gasket and used some silicone on both sides this time. Going to let that dry overnight before refilling the system. Everything else is buttoned back up and ready to go. I'm going to check the last item on the clutch later today, it's a bit muggy out at present.

Oh, and while the new alignment is ace, it doesn't stop power-on oversteer. Things are pretty controllable however.