Hi agodber.
It may not be the parallax if its already set to around 10-15 yards, it’s more likely the mag is too high at 4 minimum and though it may work at distance, at close range you would need to use a minimum mag of 2 or 3 lower the better.
It would appear the Pard can increase the mag up to double, so if you use a 4-16 scope even on the lowest setting it will be around 8 magnification.
For close range a scope with a magnification of 2-7 or 3-9, 3-12 will work, preferably with a side focus then your hand doesn’t get in the way of the IR when you change distance.
You can still use the Ao without a side focus, but I just would set at a distance you want and leave it.
Some slight adjustment with the Pard focus will sharpen the image on a lower mag.
There are members that are much more knowledgeable than me, but this is just my experience.
It does take a little getting used to, but it is good once it’s set right.