Interestingly the output gain of the CJ is either 22 or 27 depending on where you look (different models?) and the BAT is 20. This suggests to me that the BAT output stage is just inherently noisier than the CJ or that the tubes you are using have not been screened for noise, i.e. 'low noise'. Maybe both.
BTW, FWIW, cabling, wires, cords, connectors., etc can have an effect on tone and clarity, but they do not create or reduce 'hiss'. If you really like the BAT's sound more than the CJ, and that's apparently the current issue, just focus on the gain issue, i.e. tubes and/or attenuator. But if the CJ is just as good to your ears when combined with the Rogue, just use it, and put the BAT in the closet until your change your mind. :-)
BTW, FWIW, cabling, wires, cords, connectors., etc can have an effect on tone and clarity, but they do not create or reduce 'hiss'. If you really like the BAT's sound more than the CJ, and that's apparently the current issue, just focus on the gain issue, i.e. tubes and/or attenuator. But if the CJ is just as good to your ears when combined with the Rogue, just use it, and put the BAT in the closet until your change your mind. :-)