@jfrmusic I have tried power cords and other cables at various price points. Unfortunately I haven’t come across any giant killers yet. As with any component or cables you have to hear it in your system to gauge the degree of improvement if any. So best to either buy used or buy new or open box with return policy.
Stock cords don’t kill the musical enjoyment and there’s no shame in using stock cables, but they can be improved upon.
Power to your amplifier and the speaker cables are probably the two most important links in the cabling chain.
I’ll be blunt. With the level of components you have I wouldn’t waste time and money looking for a miracle with $200-$500 cables from boutique manufacturers. Use stock or get the cabling that’s on the same level with the rest of your components.