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I have the 6.7, 11 and 18 in the ES82°, they are awesome. I agree on sticking to 3 or 4 EP's and keeping the steps between them consistent. Like you I also have a handful of plossls that are a bit disappointing after the ES so I haven't looked through them since. I also have a 30mm SV so roughly 1.65x steps. SkySafari lets you simulate FoV with various EP's which is useful in deciding.
In my 12" the 6.7 gives me 225x which mostly sees use on planets and tight globulars etc. On good seeing it is fricken amazing, on the weekend just gone the seeing was particularly good and I got the best views of Jupiter I've ever had. I barlowed it to push it a bit further but it wasn't really worth the gain going to 450x. I generally avoid using barlows and really wish I had a 4.7 just for that!
In your case the 6.7 is pretty close to the 8.8 and 180x might leave you wanting on planets, but the 4.7 @ 255x might get limited use some nights due to seeing. Tough call!
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