OP, FWIW read ghdprentice's post to rvpiano's thread about music v audio. It is excellent and mirrors my life experience.
I agree with his advise re your Bryston. You need something in your system which you must buy on faith knowing that it can last a long time. The only component that can serve you so well is a pre-amp. I had a SOTA ARC pre-amp which I used for over 30 years and it took me thru many speakers and amps. I never regretted its purchase (and when I finally sold it I got more than I paid for it!)
If I were in your place, I would for the purpose of limiting my expenditures get the Roth 20db fixed attenuators ($60 +/-) which would allow me to hear exactly what the Brystons contribution to your sound was when operated in it's more optimum range. If that would work (and I don't think it will really solve your underlying issues) you will be happy, for a while at least). IMHO this is the only reasonable solution to your volume control issue I don't like stacking volume controls of any sort including variable attenuators, except perhaps the Placette which is somewhat costly.)