I too play with this mod (1.03 though) and i check speed by using the faster method (the scales on the chronometer) and adjust it if target is not exactly 100/150 etc meters long.
The AoB also i measure it by eye.It takes me too much time with the disks.And actualy i get pretty good results (100% playing).I alomost never miss(when firing at mearchants) except the cases insted of 3km on the tdc i place it to 300m
I couldnt remeber the steps so i writed the 3 (speed,distance and AoB) on a piece of paper(while watching the tutorial) and i keep it close to me when playng.
Thats it from me i hope it helps, if not i will keep thinking how to...