With your current lineup, yes I would suggest you sell the 17 Ethos. I have one that I don't use often, but I bought it to use in a scope coming later this year. Otherwise I wouldn't own it either.
Use the funds to buy a 10mm and 8mm to fix up the gap you've got there. You may want to keep the 6mm for nights of good seeing, your choice.
I've used the Delites, and as dedicated deep sky eyepieces they are a backward step for someone who already owns Ethos/Delos eyepieces.
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