It would be interesting to know what line stage(s)/preamp(s) you are using.
The output specs for the 005 are: RCA 2Vrms, XLR 4Vrms
The same for the Gustard X30 Quad Core ES9039SPRO DAC which is probably designed for a larger distribution: RCA 2.5Vrms, XLR 5.1Vrms. So I judge the 005 to be within a normal range.
A solution could be to install resistors in RCA cables or use a device (British, I think) with RCA jack at one and, plug at the other and resistor in between. I don't know if there's a similar device for XLR.