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Coma correctors correct primary mirror coma. They do not help with aberrations in the eyepiece except a little correction in field curvature as is the case of the Paracorr being a 1.15x amplifier.
Is your dob really 8" f8? I think 8" f6 is more common. At f8 you don't really need a coma corrector. Even at f6 coma in an 8" is very small.
The best solution is better corrected eyepieces so that all that is left is primary mirror coma which will be tiny in an 8" f6 and even smaller in an 8" f8.
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