I've been wondering this also, so you say the best way is to dthrow, dash to shield A, rinse and repeat right. I tried this, but i didn't notice a difference, but there prolly is
There is, at first it wasnt obvious, but i wouldnt post if it wasnt confirmed.
its a finger dance on the controller once you get it down, second nature.
its not even dash, its just trot and then your only concerns are doing the
consecutive R-A, or shield then grab. (i hold R after pressing it, as opposed to tap)
the timing makes it seem like you press shield and grab at the same time, but it isnt,
its best if you put the speed down to 1/4 and do this.
as soon as you can trot, you activate the shield cancel, then grab.
in 1/4th speed try the same thing like i said, with normal dash grab(z)
you should notice you cant CG with z directly out of trot, which is what SCGs do.
it has to be frame perfect, that makes it sound hard but really, it isnt after a while.