Warm the motor up first and then readjust them at TDC to see if that fixes the problems
let us know your results
if you do take that one liftter out take a close hard look of it together and then remove the snap retaining ring to see how much the lifter cup raises up in the lifter body, me thinks the oil hole in the lifter body will be exposed once the ratiner ring is remove allowing the oil to drain out which wouldn't hold the lifter cup up enough to make the lifter that much higher