This is the best I can do to match chemistry, doesn't mean they will melt exactly the same as the right frit but could be a start. Hard to get enough sodium in and always too much alumina or calcium. They use a lot of soda ash while making frits I think. Don't know how usable it is for a glaze material as it's soluble. 3110 was pretty much impossible to replicate.
There really should be a difference in weight. I don't think clay should weigh anything like silica or frits by volume.
The problem with scoops is they are inaccurate, If the weights were right and you retotaled the oz values into 100 then you could probably in theory work out what you need to add. That guessed recipe might not even match to what you actually scooped in.
I worked out from your weights you have double the rutiile in the recipe or 195%
I generally start with 2/3 the weight of water. So if I am making a 5kg batch of glaze I will chuck 3-3.5 jugs (1000ml) of water in the bucket first, add dry and mix up then measure SG the next day and add water as needed.
I find 2/3 weight will get you to about a custard consistency
Pretty much every glaze recipe you find will have a feldspar in, so what is the difference? In my opinion not too much but they all bring different things to the table.
Here is a pic from digital fire melting feldspars, you can see there are differences in the way they behave.
Now which one should you choose? Probably worth getting a high potassium feldspar and high sodium feldspar and seeing which one works best for you.
Kaolins and ball clays will be relatively similar (like feldspars) to each other but all bring slightly different things to the table. Again it will be maybe trying a few out and seeing what works best. EPK seems the go to.
Silica, that will be there too. Mesh size, as fine as you can but 300 is good.
Frits, I don't have that much choice over the pond but 3134 and 3124 are common in john brits cone6 book.
For a calcium source I like whiting but a lot of people use wollastonite.
So for a basic clear you need a feldspar, silica, clay, frit and calcium source.
A source of magnesium oxide is nice too, talc or dolomite.
I really enjoyed doing the challenges but I have stopped running any. I felt they had run their course as participation was dwindling and my ideas were not bringing people in. I had fun trying it out and thank you to everybody who joined in but don't feel bad if you didn't.
Anybody is more than welcome to take up the community challenge torch and continue.
As Polydeuces says they are mostly made hollow and one hole at the bottom of the bowl. This was the best picture I could find, there's no reason it can't be solid and you have to match the holes but I guess making it hollow is easy with glass. Some seem to have this hole on the side too.