I looked back quickly through the thread but I didn't see any info on what kind of incubator you ended up using and if it was a still air. Temp needs to be up at 102degs for still air and 99.5 for forced air so as your cells are smaller than ideal and the eggs are a little late to hatch, your temp might have been too low as well as the humidity being too high. Sorry if you know this stuff already and I missed the info in the thread!
The float test is not really a super way to go unless you are at the very far end of the incubation process with eggs that are 3-4 days late and using this technique as a LAST resort. If you have the possibility of an external pip, you can drown the chick. But, seeing as how you did the test already and found the eggs to be viable and alive, now you just have to wait. You may find that the chicks start to pip in a different location than the air cell as they may not be able to turn correctly if they have grown too large in the egg. This is also another issue that happens when the humidity is too high during incubation.
If they do pip on the wrong end of the egg, don't panic. These chicks usually take significantly longer to zip than if they pip in the normal way. Keep posting please!