There are a couple of options I'd consider, which I think you refer to:I bought the ifi power x it works great my question is can you use it to also charge XD05 pro
also im using my Shanling M6 ultra as my music source do i need to using it in the line out mode or can i use it using my 4.4 out to the 4.4 in of XD05 pro if i do do i need it in the line out mode or can i use it in the headphone out mode
1) USB-C to USB-C - you'll just use the M6 Ultra as your music source, so the XD05 PRO acts as DAC and amp
2) Line Out from M6U to Line In on XD05 PRO - assuming you have a proper balanced Line Out function in the M6U (not sure, but I assume that can be set in the software on the device), this would allow you to capitalise on the amp in the XD05 PRO only. The M6U would act as the DAC in this case.
If you use headphone out mode from M6U, you're effectively going to colour the signal with the M6U amp section before hitting the XD05 PRO. It's likely to sound worse, imho.
With regard to feet, I think there are plenty on the former bookstore only site. I personally don't want feet on my XD05 PRO and don't have an issue with it getting a bit warm. I'd just pick some you think look right for your circumstances.