I found the recommended TA figures in the books very confusing, and deviating from them did not hurt at all in several experiments.
Blowdown time in diesels may be just as important as blowdown degrees. Since small glow engines rev higher than diesels, 10° may indeed be adequate, where normally I would prefer 15 - 20°
A good wellbehaved sportstiming could be:
120 - 140° exhaust
100° transfer
inlet opens at transfer close, closes at 35°-40° atdc

Don't look at others except for rough guidance. It never works their way in your own designs.