I candle at 7, 14 and 18 but sometimes I just can't resist and check on day 5 on 1 or 2 of the eggs. I love this ladies' website for hatching. It reminds me of that book, "What to Expect when your Expecting". She goes through each day of the hatch and what's going on inside the egg on that day...
Those look good. Are they darker eggs? That could be why it is hard to see if there is any veining or not. Also, did you mark the air cell growth from day 7 to day 10?