Dedicated power lines for audio?

I recently added a dedicated line along with isolated grounding. A very positive improvement in the sound quality of my system. Highly recommended. I used quite a bit of the information from several of the Audiogon threads. Thanks. The one thing I didn’t gain any improvement on was the directionality of the main wiring (as Redkiwi says). I wasn’t able to here an audible difference by changing the direction of the wire. I followed the same process and ran the wiring on the outside of the house. I actually tested is four different ways (switching both the hot and neutral wires). I’m curious if others are finding that directionality makes a difference? I used stranded 8awg from the main breaker and a combination of 8awg and 4awg for the isolated grounding (yes it is probably overkill but what the hell). The main wire was pretty stiff and somewhat hard to work with and barely fit into the wattagate screw down terminals. The ground wire was Esoteric Audio car power wire. It consists of many strands of copper and is very flexible. I fed the main line in series to two wattagate receptacles (about 6' apart). From the wattagates I used short runs of 8awg to a copper grounding block and then approximately 10’ of the 4awg to the outside grounding rods. I used two 8 footers about 18” apart. The best comment that I get is when my wife asks me if she can water my rod when she’s done with the garden.