I found the below information while doing some research (this was an answer to another problem that sounded almost exactly like the one I described in my original note).
Opinions?
This is rather unusual. In effect, you are making your ADD stronger by increasing vertex (since plus power becomes stronger as vertex increases). I would suggest having your eye care professional hold a +0.25 single vision lens in front of the eyes when you are looking at intermediate to see if this improves things. If it does, the ADD power could be increased by either +0.25 or +0.50 (since at intermediate will only get 50% of any increase).
Other than that, they could try a duochrome test at near when you are wearing your glasses at the normal location vs. when you wear them down your nose.
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