I bleed for zero rebound and usually get it by bleeding it twice and not inserting the bleed screw until after the second bleed. I compress the shock very slowly then pull it all the way out and slowly bleed again. If oil doesn't come out on the second compression or at least to the top of the threads, i will add oil again and start over.

Not saying im right because im so new to the sport but i can usually get zero rebound as well as, zero suck in.

Also, i just built a new kit but haven't run it yet but i will say my old shocks were tired but i did get them back up to par. If you've had your big bores for a while and notice that the gold coating is wearing off, i would replace them. Im selling my current car to my brother and replaced the rear shock shafts because even with a new rebuild kit the shocks would have oil on the shock eyelet the next day after a run. When i would bleed them after a run, the bleed screw would shoot out once it was past the last thread due to the air buildup, therefore it was taking in a lot of air throught the bottom. I got to run the car last weekend for the last time with the new shock shafts and it was way more consistent.