Sorry I am late to your question, I've been on the road for the past week.
I'm always hatching turkeys, what can I help you with?
For candling, by day 4/5 you may see a slightly peach tinted glow when you candle, but blood vessel development isn't always obvious until day 7/8 depending on shell pigmentation. Stinkers are usually evident by day 14 but always sniff test when you add water or when you hand turn. I had one in this incubator load that I found in the outdoor run, it must have been buried for a while. :gag. When candled, it showed an irregular mass not at all like a clear, but no blood vessels.
I start incubating at ambient humidity for the first 9 days, add a little water as needed to average 30%-359% up until day 24, then stop turning. Since I am often not home, using this method I can raise the humidity at lockdown to 75% for hatching with the vents wide open and I do my best not to interfere until hatch, as turkey outer membranes toughen up when exposed to air.
