Based on all information we have discussed above, summarize and darely conclude as follows;
Becaude of minimum rpm setup, the first flip over Hall sensor can not make CDI to ignite how faster you crank the prop, but second flip passing over Hall sensor will ignite depending on the rpm higher than 120 rpm. Because CDI fires at BTDC, the rotating propeller with enough momentum passing through TDC will start forward, otherwise it will rotate backword due to very strong compression of OS GT gassers. That is why OS recommend to use an electric starter, I think.
In my case 19x10 wooden peopellers (more momemtum) started forward easier than 18x10 prop (less momentum). Someone (I have to wait until weekend) do test it with chicken stick. Crank it one complete rotation of propeller passing through second TDC faster than 120 rpm enough making CDI to ignite, like an electric starter, not just hitting prop with groved hand.