the main reason for not starting on fully seq was the cam sensor, I originally set it as per the LSJ engine. So a small tooth at Number 1 firing and large tooth as Number 4 fires.
By removing the cam sensor assembly, turning the internal trigger disc 180 degrees and refitting the cam sensor, so small tooth as Number 4 fires and large tooth as Number 1 fires, the ECU got the sych ON command. Basically the Omex got a longer signal when Number 1 is about to fire.
Then it was a case of getting the correct offset figured out, because the semi-seq timing was 0.1055 I thought why not try 0, 6, 12, 18. It fired straight up, but Omex did not want the timing set at 0, so readjusted the coil timing back to 10, 16, 22, 4 and offset the crank trigger wheel to 2 and after fine adjustment it was 14.125 (it did not like 2.125, so added 12 - which is 360 degrees / one engine revolution)
edit: by switching off the tickover 'scatter spark' it is much easier to set the exact timing on any Omex ecu