The only way it comprimises the hatch is you touching the eggs. I use two or three fingertips only to hold them and ALWAYS just freshly washed my hands. Yes, you can candle them again. Day 10 should be easier to see the development. You seen the pictures I posted on my thread... if they are...
I'm sorry to hear about Mabel.
I hope the eggs hatch well. I agree. It is too early to toss any. Unless they stink, it won't hurt anything to keep them in a bit longer to be sure.
Dark spot are good. Clear may not be but probrably are infertile. And the blood ring MAY be a early death. Hard...