Sorry to hear that. If it's any consolation they probably would have died anyway had you helped them, usually if they aren't strong enough to hatch by themselves they aren't strong enough to live.
If everything was fine (temperature, humidity etc) then there wasn't really much else you could have done, sometimes these things just happen.
Sorry to hear you lost them both, i hardly ever catch mine pipping, seams i walk by and look though the hatcher door and nothing, walk by 2 min later and there are 100 wet little quail looking back at me though the door then a few hours of nothing and all at once a second wave pops out within about 30 seconds of each other.
if you were local to SE Bama i'd give you a few, i have both cabinet incubators full and about 300 more to find something to do with (prolly pickle them).
I just candled the Eggs and I saw number 1 moving a lot like its legs! Then I candled 2 and it was moving too! same for 3 and 4! I'm really excited because I didn't see this action in the other eggs!