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Allan are you binoing with the SIPS? You don't bottom out and hit the lens?
The ES 20mm weighed 990grams from memory and you can put a Coma corrector in the focuser they aren't that big…I just prefer the 68º eyepieces. 82º I tried but never really liked but the 68's hit the spot for me…and lots of others too. Can you try a 20 ES 100º and send it back and get something else if you don't like it? Worth asking.
The 20mm ES 68º I use in the Newt is Coma free to about 80% out. I'm a refractor user mostly and the ES 68's are all pin point sharp to 98% out. The last 2% isn't worth the hundreds of dollars extra to get Panoptics.
If you buy used most likely you can sell for much the same price if you decide you don't like it.
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