Loosen all of the rockers arms untill they are are at least on full turn from zero lash. Then run the engine and let the lifters pump up. You may have bled a couple down all of the way. Now they may be feel like solid lifters.
I had some trouble at first with my Chevy lifter adjustments. It seems like the Chevy lifters bleed down a lot faster than a Ford lifter.
Once the lifters are pumped up all of the way, you should adjust them with the engine shut off. I never have agreed with logic behind adjusting hydraulics with the engine running.