Aesthetix Calypso - High or Low Gain Setting?

My Calypso arrived many months ago and the jumpers are set to the low gain setting (-12 db vs. -6 db). I have not played around with this jumper yet other than with the original tubes when the unit arrived. In the upper gain setting, the unit/tube noise was more audible at lower volume settings. At the time I had not yet had a chance to bring in new tubes, which I have been doing over the past couple of months.

Any Calypso owners have any comments or suggestions on the higher or lower gain settings (jumper) in terms of overall performance?

Thanks in advance for your reply.