I’d change your near zero from 35 to 20 yards.
Once you zero at 20 then move a target to 50 yards and shoot a 5 shot group. If you are close to zero at 50 then move the target back to 35 yards and shoot it. This may be close to the apex (top of the pellet arc) check where it hits. It should be (guessing I don’t know how fast your pellet is moving) around ¾ to 1 ¼ high at 35 yards
Give this a try, and let me know.
if you know how fast the pellet is moving you can use chairgunhttp://www.chairgun.com