Rob from TRUE has actually been in contact with me today. I asked if he'd clear up some things I've seen in forums. Regarding the difference between tan and dark liners:
"-the standard True branded clarino liner vs. the old style tan clarino. The only difference is the colour. All material is exactly the same. If anything, the branded clarino is tested more durable."
Regarding a tight or "Pro fit":
"-for the tightest fit, when heat molding the skates, make sure that the store is following the newest heat molding instructions. This will remove all negative space in the boot. Really cinch in the heel area, this will eliminate the heel from moving during skating."
And also included a video, which Im assuming is available to shop employees with fitting instructions including plastic wrapping the skates from mid foot to heel many times, with each time adding slightly more tightness to the boot. I believe it helps lock in the heel as well.