Fine-tuning the set is a skill. An art. And sometimes an endless occupation. But that’s just the fun of it!
We hope that we have been able to help you a bit with the tweaks we have suggested. Placing speakers correctly is free. Connecting your system in phase is also free. So is cleaning contacts and checking various filters of a dac; should the device have that capability.
Sawing some wooden blocks and adjusting the acoustics of the room doesn’t have to cost a lot of money. But it can do a lot, in case of acoustics. It really does pay off! Have fun tweaking!