From your 16 T5 down you have exit pupils of - 2.5, 1.7, 1.4, 1.0, 0.7, 0.6.
I don't think you can jamb another eyepiece in the middle of that lineup because you have got it all covered. Opinion is your best eyepiece should be twice your f/ratio. So 6.3 x 2 is 12.6, and you have that pretty well covered with either your 16 or 11 Naglers.
Your Celestron Plossl has a 52 degree AFOV. So you might consider buying a wide field eyepiece to replace or complement that. But that means going to a 2" eyepiece. A 41 Panoptic would be nice, giving 30x and 6.6mm exit pupil and 2.2 degree TFOV with your reducer in.
If you only want to use 1.25" eyepieces I would say you have already got a well covered lineup.
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