I think the 45/30deg thing is the same as two same engines cant be that different, depends on how guys measure it and rotation used as you can get a spark at both ends of the pickup when turning it by hand and just watching the spark.
Correct setting is as magnet leaves the pickup in direction of prop rotation.
It is difficult to get an accurate test with just watching spark, best method is with the rcexl buzzer/led fitted to the pickup.