I have not done what you have done, but have run a Tubed DAC along with a non-tubed transport on the same P300 and found the improvement to be essential. No longer can I run my gear w.o it.
I went ahead and got a P1000 and power all my gear with it
If you have the money, it is worth a try
Shameless plug---If you are looking for a P300, mine is for sale since I got the P1000
I went ahead and got a P1000 and power all my gear with it
If you have the money, it is worth a try
Shameless plug---If you are looking for a P300, mine is for sale since I got the P1000