I respectfully disagree with the 2nd hand accounts
that a narrower roofing filter in the Omni VI+ shows
no benefit. I don't know what those sources of
information were.
The only person I know to have conducted such tests
was George W2VJN at Inrad. I remember him finding a
substantial improvement (I can't find the exact
numbers) when replacing the 15khz filter with a
ssb-width filter and using 50:200 ohm matching xfmrs.
He also suggested trying a cw-width roofing filter,
with a gain stage if necessary. I believe other
projects pulled him away from any further work and I
shuffled rigs before getting a chance to implement it.
73,
Barry N1EU
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