Yup we have all been there
My technique is insert bladder and foam into top cap making sure the bladder really is seated ALL the way into the cap and it is level from all views. Then I push the piston in (from fully extended) about 50%. Then I screw on the cap and after 2 turns I release the piston. That gives 100% rebound with no problem in pushing the piston in 100% 999 times out of a 1000.
I aim for 100% rebound but in terms of adjustability what I will say is that when I have wanted to loose a bit more oil, opening the cap 1 turn and pushing in the piston has released oil through the hole as required.
I have no idea what is going there and why it should work, as against not pushing the piston in before applying the cap and bladder but it works for me.
No doubt I will move over to the low profile bladders once I have used up my stock of "original" bladders