I think your amp is the weakest link in your system. Changing out the Rogue pre for the BAT pre's listed is a lateral move at best... maybe a step back. Your cdp and speakers have good reputations, so additional improvements would come at a high cost.
Suggest you sell your amp and buy a Plinius SA-102, Audio Research 100.2, or Levinson 23.5... or you can try spending less with some tweaks, such as trying some good NOS tubes ($400) for your Rogue preamp (try Brendan @ Tubeworld).
Suggest you sell your amp and buy a Plinius SA-102, Audio Research 100.2, or Levinson 23.5... or you can try spending less with some tweaks, such as trying some good NOS tubes ($400) for your Rogue preamp (try Brendan @ Tubeworld).