It will be set at 28 BTDC. I found that the ZDZ module was set at 6 BTDC when following the instructions, I had ask RCS what the timing should be set in degrees and was told to set it to the dimension in the instructions, however in my case the instructions were revised. I can remember 6mm, 6.5mm and 7mm, pick one. I found that 6 BTDC worked fine although the engines do bite back once in a while..
I plan to fly the plane on Sunday and get a good base line rpm, change the ignition next week and compare. I'll results and photos. I expect the everything to go without a hitch, time will tell.