This is the timing chart I came up with, and programmed into the SDS engine management system. I took the liberty of photoshopping in the MAP readings in inches of mercury and PSI for my fellow Americans.
This is not a 'perfect' timing chart, because I haven't tuned it on a dyno. But the engine runs well with this curve, and revs quicker than stock. I'm thinking it's pretty close.
IMPORTANT: The gray line across the middle is the BASE TIMING curve. It strictly relates to engine RPM only. With the SDS system, you program the BASE TIMING curve, then a LOAD TIMING curve that advances/retards according to manifold pressure/vacuum. I did NOT program any of the LOAD TIMING values below 19.19 inHg. (It uses the BASE TIMING setting only at these pressures) The reason being, you only see these pressures at idle, and since idle is already programmed at 15 deg. BTDC, no further advance is desired at these pressures. Note that the chart doesn't show any correction at these conditions (low RPM, high vacuum). So basically, if I took my values out of my computer and made a chart according to them, the bottom three rows would show the same as the gray row, the BASE TIMING curve.
Hopefully, this helps someone out there. I'm not messing with my timing anymore until I get to a dyno with some high test gas. Feel free to chime in if you see something seriously wrong with my chart, but like I said, it runs great on this curve.