@RRJ welcome to the forum. Certainly even with the power plants - The idea is to improve the ground across all attached equipment - My going in position was i didn’t expect improvement in my P20 but I was wrong - we aren’t talking game changing massive changes but the background is certainly cleaner across my system. For the P20 I just got a furutech spade (they make a smaller one for power connection that works well with screws) and changed over one of the Syn leads i did this to all 6 of the supplied leads terminate one in RCA one in XLR and the rest in spades.
I did also get some of the new HD leads - i ordered the old ones the new ones came out and Cable co managed a switch for me. The HD cables don’t add significant change. I tried the standard lead on my Gryphon Diablo 300 and the HD one and there was a slight change but its slight and maybe the mind goes i paid 150 for that so i should hear a difference 
Across my system I applied to the following
PS20 - Improvement noticeable cleaner
Server (input power earth) - Improvement slight
PS DSD DAC - improvement medium
Gryphon Diablo 300 - improvement medium Melody Gardot certainly sound better / more depth
Maratnz HT receiver - no improvement
cable box - no change
Rel Subwoofer - reduced a HUM when feeding from both amps
Oppo 4K player - no change
That being said my wife who can walk into a room and go yes better or not also gave the tick of approval to the Syn block for the money it a good play and made improvements - would i would go up the line into active - probably not at this point