Although I currently don't have ducks I had muscovy for eight years, during that time I had hens hatch duck eggs fairly regularly without any problems.
That's my advice, but you're the one that's right there. If you have a deep inner feeling that it would be better to take them and put them in an incubator, perhaps you should. Sometimes our instinct is more accurate than any advice we can get.
If you just really feel better having them in the...