You know you are there or almost 99% there when you don't need crank up the volume and you don't want to leave your listening chair when you start listening to your favorite CDs/Records. Yesterday, I just fired up my system and played Coleman Hawkins' Reevaluations: The Impulse Years. What a treat. This is a 2LP set well recorded and Hawk's play was sublime. An all star supporting cast has contributed to tracks on this set. Then I played Johnny Hodges' Rippin' & Runnin'. Rabbit kept me tied up to my chair until past midnight.Volume level was around 75-80 dB range.
My biggest fear is, my phono cartridge is very old and I am planning to change it. I am a bit worried that the new cartridge may take time to break-in and am not sure if it will sound as good as old one even after 200-300 hrs.
So my advise to you is make sure you can get back to this position if further improvements/changes are not to your liking.