Room Ceiling Height for 2 channel listening - is taller always better?

I am planning a custom 2 channel listening room. Current dimensions are 17’W x 23’L x 16’H with a symmetrically sloping ceiling. No windows. The room will be accommodating Paradigm Persona 9H speakers, but I’d like it to be flexible enough to be well suited for most other options (i.e. big horn speakers, tall Wilsons, etc)

Is 16 feet too tall? Is that violating a "golden rule" room ratio (I already know it is, but is that a big problem)? Bigger is generally better, but is a taller ceiling always better? Is this too much volume for a 2 channel listening room, even with large loudspeakers? I do plan on adding acoustic treatment throughout the room to handle reverb & reflections.

Other thoughts: I am planning on 2x6 studs and standard insulation+luan+5/8" drywall. I know that 3/4" plywood is considered better sounding at only 8x the cost of drywall. I know some would advocate for 2x8 or 2x10 or 2x12 studs, but that pretty much requires using expensive insulation (at least spray foam) or some fancy carbon diaphragmatic helmholtz solution that might cost as much or more as this room :) I know that structural rigidity is important to reduce resonances. I’m also not a billionaire and am trying to balance practicality with performance.

Flooring details: planning on sound deadening underlayment, carpet, and a throw rug on top. Should I do hardwood with a throw rug on top? If I do carpet, what acoustical carpet underlayment is recommended?