Best thing I can tell you, is don't fixate on any one type of tracking. Look at the whole picture. Tracks, blood, hair, flipped leaves, the way the grass flows when something has passed this way, Transfer blood as well as drops. lenth of stride, and direction, (toward water, brush, lower ground, or ridgeline, direction gives you an idea what the deer is thinking, stride tells you how strong and surefooted he is, flipped leaves from dragged toes and grass tufts can give you direction, check carefully at all fences, if he jumped, he will dig in further, if he went under he will leave hair, blood is obvious( how heavy bubbles? bile?) I carry a roll of surveyer's tape to mark the path as it unfolds, and break and shake chemical light for low/ no light tracking. I don;t know if the blood lights help or not, I have never used one. I have a color blind uncle who tracks sign very well, and I track transfer and blood trail better than most, when we are on the same trail we can usually track at a walking pace, and we have found a few that others have given up on. Last year, we found two deer at the same hiding point, one warm and one long cold. Had it been a day or two fresher.....! The only real difference between a good tracker and a poor one is attention to detail.
The only real difference between a good tracker and a bad tracker is observation. All the same data is present for both. The rest is understanding what you are seeing.