This first one has 5 coats, as you can see there was a lot of running but the colour is perfect.
. Hahaha this is a funny glitch no matter what I do this photo won't post upside right . . . Sorry
This one has four coats, less running colour is still okay but still some drips.
when I did the three coats it was like you said muddy all of theses were fired to cone 6, all holes and lid closed tight and I have a down draft vent.
The frosted melon worked very well this has 5 coats and no drips or runs but when I fired the test tile I had a pot glazed in misty mountain blue next to it and the frosted mellon got some yellowing, I thought it looked fine but if you don't want that on your pot you should be carful what you fire next to it.
The olive speckle needed a thick coat as well, this plater started off with four coats and the streaking was terrible sorry i don't have a photo of that but I decided to put another coat of glaze over the already fired piece and refired it, this is what I got . . . I might try another coat and another fire tho
This one is glazed in smokey merlot I think it's called, I'll go look and update that if I'm wrong, I have four coats on this the three coated tile test was muddy
I have a bunch more and a few layering photos if you want I can post those too but but it seems to me the four or 5 coats is what is required with all the Potters choice glazes I have . . . Now maybe what I personally think is a thick coat is actually thin by Potter's Choice standards and that's why I need to put more . . .
The other colours I have are fire brick, palladium and Art Deco green
If you are going to layer you might even want to try more than 4 coats like for example the bowl in this photo is glazed with 2 coats of frosted melon and 2 coats of firebrick I personally don't like it and might try putting another coat of firebrick or even something else just to experiment. . . .