Wow, five weeks to get an IC changed! You're slow! ;)
Seriously, Nonoise, glad you're having fun with wires. It opens a new world to system building, one with profound results. I would encourage you to take the next step and work with sets of cables. They do not have to be expensive, just consistent. You will find even more avenues to better sound via swapping around the entire loom of cables, including speaker cables.
Consider, if you use two cables one will be sonically superior - I find that a "better" cable is so across the fequency spectrum, not only in certain frequencies. Ergo, you would be more advantaged to have two of the better cables than one of each. This is why comparing sets is advantageous, because you can hear the holistic effect of the better cables. If you thought swapping around a couple of wires was impressive, wait until you hear what a fresh set can do! It will make the single wire change seem relatively inconsequential by.
Testimony such as yours is very valuable to the community, since there are always newbies and skeptics who have not tried even such simple changes because in principle they feel it's not worth it. You are now adding to the experiences which show that cables are critically important to tuning a rig. The difference is not small, and in fact only grows to be even more influential as the quality of the system rises.