You're trying too hard. Experimenting with the Niles isn't helping any either. Putting that in changes the sound of the system. Most people can hear some differences between cables but it doesn't always happen right away. I couldn't for a long time but now I can easily hear differences. Its one of those things that once you hear it the first time, it becomes easier.
Whatever you do, don't force the issue. Reading reviews and comments by other people is tempting, but if you're not sure, don't make any investments in cables. The safest way to do it is use The Cable Co. I mentioned them in your other thread. They will send you a bunch of cables to demo. If you don't see the value, you don't have to buy anything.
Either way, you have a really nice system. As long as you cables are OK and working, it should sound pretty good.
Whatever you do, don't force the issue. Reading reviews and comments by other people is tempting, but if you're not sure, don't make any investments in cables. The safest way to do it is use The Cable Co. I mentioned them in your other thread. They will send you a bunch of cables to demo. If you don't see the value, you don't have to buy anything.
Either way, you have a really nice system. As long as you cables are OK and working, it should sound pretty good.