I have a Brinsea with the 24 egg disk and I'm so annoyed with it! I chose the Brinsea because I had read they were really reliable and I wanted something I could trust to just work so I didn't have to worry about it. I was deciding between the one I have (Maxi 24 EX) and their other type of one that holds the eggs upright but I chose this one because I have a 6 year old and wanted really good visibility.
I have to say the temp and humidity control is perfect but otherwise I was expecting a lot better quality from the whole thing. The plastic parts seem so cheap and flimsy. It's totally overrated for the amount of eggs you can fit in. They don't turn properly at all. They keep getting stuck against each other and against the side. They slide along instead of turning. And if it's not full and they all have space, they clatter around, risking damage to the eggs. There's not nearly enough room for 24 chicks to hatch in there so you have to open it all the time to get batches out. I've only hatched regular sized hen's eggs, it's not like they were particularly large ones. In my first two hatches, as I had quitters, I swapped out a couple of the quadrants for the duck egg ones and they turned better with more room but they still clattered around.
The other thing was that I got so many malpositioned chicks. Almost half of my eggs from my first hatch and more than half from my second were malpositioned. I troubleshooted everything that could possibly cause malpositions and deduced that the way the eggs sit in the trays and the way they kept sticking was the problem.
For my third hatch, I designed a solution by making a modification to the base. I made a cardboard ring that's positioned so that it raises the eggs up so they're at a tilt instead of flat on their sides and I cut some shelf liner to go on top of it to add traction. I just finished my third hatch now and the eggs turned perfectly the whole time and I got zero malpositions. I'm using it again for the 24 I've just set now and they're turning perfectly as well so far. I must take some photos of it when this batch are finished.
I really don't think it's fit for purpose as it is and I'm surprised they're allowed market it for 24 eggs. I was thinking about buying a different model and just using this one as a hatcher but since my modification worked so well I can probably stick with it. We'll see how this batch does now.
Did you try turning some of your eggs around to point out instead of in? And swapping particular eggs around into different positions? You might have to do a lot of fiddling to improve the turning.
Hope you are feeling better soon. 
