to bi-wire or not?

This thread got me interested in trying bi-wiring yet again.  I'd tried it in the past but didn't think there was much benefit if any at the time (different system components than now; different wire).  Tried it this weekend running Cardas Parsec cable to lower posts and Clear Day double shotgun wire to upper posts of Prelude Plus speakers.  (I know -   some experts say not to use different cable types.  We appreciate expert opinions.)  Amp is a Hegel H200 (two pairs of outputs for each channel) in HT by-pass mode using a Freya pre amp in JFET buffer mode.  This time around, I did think bi-wiring made a difference; very similar to the comments of @will62 - more air, detail, a bit more separation for instruments and voices, and better imaging (more stable, better defined, more 3D).  I'm not saying it was a huge night and day difference but improved enough such that music sounded "better".  Didn't hear anything that could be considered a downside.  If interested,  rather than agonize over theory, it's worth experimenting and trusting your own ears.

The Cable Co. advisor also suggested trying bi-wiring with jumpers in place.  Apparently this is something Chris Somovigo (StereoVox, BlackCat Cables) advocates.  I tried it in the course of recent bi-wiring experimentation and did not like what it seemed to do the sound.  The sound lost impact and became a little recessed.  Went back to single wire for a while and then the next day, removed jumpers and tried bi-wiring as described in an earlier post on this thread.  Bi-wire without jumpers is what's in place today.  FWIW

Just in case clarification is called for, I was definitely not trying to contradict soix experience of bi-wiring with jumpers still in place.  The only way to know for sure is try it for yourself.