I checked my Polycharger dosing chart (I can email you the pdf file if you PM me with your email address) and you are correct, 4 droppers per 16 bottle. David B mentions Glanz Polycharger dosing in either one of his Klasse articles or a Polycharger post. If I recall correctly, in one of those, he even advocated using more (?), but I don't know if that was a misprint or in the early days of Polycharger testing.
I've tried application via (1) spraying on the paint / wiping off with a towel as recommended; and (2) spraying on the paint, spreading with damp microfiber applicator, and then buffing off. The results were equivalent in appearance, but the 2nd method wasted less Glanz and saturated the microfibers less, making them easier to clean later.
Results were outstanding! I especially like the appearance from alternating layers of Klasse SG (also Polycharged) with the Sonus Glanz – It seems somehow shinier than just the KSG alone. Perhaps the Glanz offers a more uniform thin coat because it’s diluted more than the KSG.