With Japanese Rhino I lost about 5% of eggs so far, with more than 100 laid. With C. Metallifer I have lost about half of my eggs due to the mite infestation, with only 10 out of the 16 eggs hatching. Most are in L1 and I assume a few more may die.
I have yet to deal with pupation which sounds as it might be as stressful as incubation.
My two pairs of Swinhoei didn't end up even laying for me. Well 8 eggs, 6 of which rotted (due to mites) and two which I discarded fearing that they might not hatch, if they did one might only make it to adult hood, and the possibilities that they would both be of the same sex. Didn't seem worth it.