After I got used to the weird buoyancy, I got to like the no-fog wide field of view.
That unanticipated buoyancy had been an issue, when I initially began using full face masks, especially in shallow waters, when replacing zincs as a kid. A number of manufacturers had offered ridiculously expensive, sometimes unwieldy ballasts for their masks (.8 kilos is a bit much on the neck, after a few hours; the mask itself weighs only 860 grams), usually to the tune of several hundred dollars for two meager wads of either lead or machined brass; though a few of us, at the time, resisted -- cobbled together our own, with bagged shot, encapsulated within lengths of trimmed inner tube, with cable ties.
I did eventually manage to find a pair of those "genuine" 600 gram commercial weights, years ago, at a local Bay Area swap meet, for 25.00: a generous 325.00 discount, off a current list price. The seller had been using them as paperweights on an old stack of 1960s Playboy and Skin Diver magazines, had no knowledge of their purpose; and was happy to be rid of them, for whatever I had in my wallet . . .