Volume Control Too Sensitive

You can put 10 or 20 db fixed in-line attenuators between your pre-amp and amp. Roth manufactures them - minimal, if an sonic down side.

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.)

I suspect that he is using a clock dial to describe his volume control position with 6 being the bottom of his dial. This would be max attenuation. I assume that 12 o'clock would be the optimum position (many manufacturers recommend something between 10 and 2 o'clock). I used Rothwell 10db in my stuff which had max attenuation between 9 and 10 to increase the range of usable control to 11 to 2 o'clock. So there, you have it, a WAG! I would not normally recommend a 20db reduction, but the OP's description of his VC position suggested to me he needed a lot to get up to 12.

If he wants to drill this down he should contact Bryston and see if he can identify what position on their VC dial would represent the optimum position for best sound quality, and if he can contact them (or some one who is knowledgeable about their product) how much reduction should be used. 

Science at it's best! :-)

OP, FWIW,  While you seem happy to be critical of a few who think your Bryston might be one of the sources of your problems (and I think you have more than just one) I don’t see you thanking those who spent time looking into your problems and provided you with good recommendations. And think. No one sent you a bill for their services! A free education.

Next time you should consider hiring a consultant. :-(