I think you are there but not really. Let me explain in simple world. Have you every heard to a road side or a band playing on street ? Theyn play really live with not amplifiers except the singer with a mic and a big speaker. All other instrument you can hear live i.e. direct from the source. That is the sound I like. But the sound I get from my system is so much artificial with HIgh highs and boom from subs. I have worked on addjusting the sound via my receiver thousands of time but not happly. But all the systems that I heard on these high end vintage speakers very very close to that live sound that i'm talking about.
You can work day and night on the JBL speakers - however,
their lower end consumer market speakers >> are not really
musical - also your room is not large and your speakers are
bigger than I would put in that room.
Also the Snell C/V speakers that you are looking at - has a
tweeter that was sourced form JBL - and the Snell people
voiced the tweeter to roll-off above 10 khz > plus they have
a lower end bass bump > I would look at a good bookshelf
speaker for your room.
Also, make final decisions on auditions, you are the one that
needs to be satisified. Measurements are only part of the story
and their is no guarantee, that the sound will float your boat.
Their can be some decent measured speakers, that do end up
with not so great resolution.