Good for you trying some. Unless you can’t live without them you should not buy them.
Speaker cables, analog interconnects, digital interconnects and power cords can all make a difference. At times over the last 50 years as I have pursued high end audio, various cables have made a huge difference. My jaw has dropped from one or more instances in each category.
But it depends on the components you own. The higher quality they are the more sensitive… and of course some are just more sensitive. I always optimize speaker cables first, then interconnects, then power cords.
Typically the most effected piece of equipment for power cords is the amp. I would try three different high end brands and if there is no significant improvement, then rejoice. I would love it if stock cords sounded the same.
By the way my experience is that high tier Nordost sound simply spectacular and low end sound just OK. My experience.
I recommend trying Cardas and AudioQuest. If you have been reading around the forum I am sure you have heard a lot about Audio Quest Hurricane and Dragon. These are probably out of your price range… and probably too much compared to the cost of your amp. If you can borrow one of these you can use it to see what a really good cord can do… then walk down the price levels. Typically a company has a house sound. If you like the sound you can choose the cost appropriate product. Obviously if you can try some in your price range that is great.
I am lucky as I am friends with a dealer so he drops stuff by for me to try just for fun. So I have had the pleasure of thing some expensive stuff.