All forward allowance methods mentioned are "tools" for the shooting flying shooter (dontcha just love descriptive English!!). IMO, like all endeavers which involve tools, when one doesn't work/goes sour, break out another; if the screwdriver isn't getting it done, get a hammer (joking). Some days/targets/guns/weather conditions/moon phases/ etc. they work and some days they don't work. If I really knew why they work and don't work I'd be shooting high stakes live birds!!!

DDA