Based on my limited experience, I suggest you try making it smaller in all dimensions.Should I make it smaller? It seems to have accomplished the desired effect.
Ideally, keep what you have for a few weeks to get used to your current reference point, then try smaller pieces. Also try that smaller piece at the eyeline position as I have previously shown - this puts the air gap nearer the widest part of the cups, which may or may not be significant.
Finally, go back to your original felt pads to see if you still like that.
OTOH, if you don't want to fuss too much about it, don't worry