@dadork
Well done for tracking down those real improvements.
Balanced operation should be better than unbalanced for at least two reasons - the overall signal voltage is doubled and with two conductors carrying opposite signals, Electro Magnetic Interference should be equal and opposite in each conductor, and cancel out.
The higher signal level may result in higher sound levels too, which nearly always sound better.
Can you comment on what balanced cables you chose, and why? Out of necessity I recently had to buy cheap XLR cables but am looking to upgrade them.