The video that shows the patched round balls being fired were .375 balls [for a .36 revolver] out of a .44 gun which won't help you with advice regarding patch size for your balls.
The guy in the video used a very thick .018 pillow ticking patch. --->>>
https://www.thehighroad.org/index.p...lls-with-a-44-remington.847348/#post-11046157
Your situation would involve trial and error just to see if it would work at all with your balls.
I think that you would need to try .005 patches and then if too loose just double it by trying two .005 patches.
And if that's too tight then go to a fabric store and find a material with a thickness in between .005 and .010. such as a .007.
OR another option would be to cut a .005 patch in half and only place it on one side of the ball on the top of the chamber which would increase the ball diameter by .015.
Patched balls can be forced in if too tight but a plastic hammer or mallet is needed.
They should be driven down to the powder but that's probably not critical.
Using filler like cream of wheat, grits, semolina or corn meal would also take up the extra chamber space and save you some effort.
Try loading and firing just one ball to see how it works before loading more.
Please understand that your situation of patching a ball that's only slightly undersized would be experimental.
I have not seen it done before but it should work in theory with the proper size patch.
But .005 patches are not very thick and can tear.
No one else has tried your situation to test it out but you can be the first if you can find the right patch thickness and are willing to use some force if necessary to load the ball into the chamber.
If all of this sounds too complicated, just buy some .018 pillow ticking and .375 balls at a local store and load just like the guy in the video.
At least we know that combination works.
That is if you can't find the right size balls.
But .375's aren't always easy to find either.
To be honest I think that this may all be a waste of time and effort.
You said that your balls are too small for 1/2 the chambers.
That indicates that your balls are an inconsistent size.
I don't know if thin patch material can make it work or not.
If someone had the patch material handy then it's easy to try, but it may not be worth making a special effort to buy it.