I have been having a problem with my non annual killie eggs not hatching well. They develop just fine , but refuse to hatch in many cases. I have tried all of the suggested methods of force hatching. Some work a bit at best.
I have tried using different water for incubation. Nothing seems to work well so far. Any one have any suggestions????

I have this problem on occasion as well, and the first things I question is if I might have overdosed the medication or sealed the container too tightly and for too long.  The former can apparently thicken the egg shell to the point where the fry can't easily rupture it, and the latter can just kill the embryos or kick them into a resting phase.

Unfortunately, attempting to force hatch isn't very effective for me, either, but paying attention to the dose and oxygen usually means the next batches hatch as expected.

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Which species?

Here's one thing I did in the past: put eggs in one of those hang-on viewers like Lee used to make, inside a tank that's kept warm and lit on a reasonable day/night schedule, with a few sprigs of java moss in it. Put a slow trickle of air into the viewer tank (which you fill with water so it stays submerged.)

Wait a few days, usually that gets tricky eggs that were close to hatch for me, perhaps it convinced the fry it was time to get with the program especially if they're close. Never used any chemicals directly in this setup no fungicides or whatever.

I often fell like I am talking to myself on these forums with such a little response from a club with so many members.
Anyway my latest batch of non annual eggs that I had stored in the Ed Warner solution do not show any real improvement as far as hatching percentage goes. Still most eggs just will not hatch. Maybe some one is trying to tell me something. At my old age maybe it is time for me to get out of the hobby?

For over 40 years years I have always used aged tap water for everything with a bit of methylene blue for the eggs. Since I have had this problem for over a year now. I have tried many water combinations in my spawning tanks as well as in my egg containers. RO/ Tap water, RO/mineral replacement, distilled water. Nothing has helped. My fish room temp. is around 72 deg. f. I have tried other fungicides and even tried not using any fungicide's with the eggs. Nothing has made any difference. I have reached a point where I do not think it is the water. I have also sterilized my egg containers with bleach solution, so I do not think they are the problem either. I too have begun to think it may be environmental, but how? That is the question.

Have you tried any of these eggs on peat or in peat?  If they still won't hatch, I suppose the next things to look at is diet and environment in the breeding tank.