OP: Most of the tweaks that you mentioned are for cleaning up the AC power. I'm a firm believer in clean power as being the foundation for good SQ.
In my experience, too much AC filtration - or a mismatch of different types of filtration - can alter the SQ to be thin and analytical - perhaps even fatiguing. Sometimes, different types of filtration can work great together. Auditioning them is the only way to know. A money-back trial period is a wonderful thing.