My 4 month old Jackson Ultima blades were just sharpened with a 1/2" hollow.
They are nicely sharpened in that I didn't get all "catchy" feelings and started spinning immediately, . . . . . . BUT, I can still slide them across the ice very easily . . a little too easily. I could easily do a sliding three turn or one foot hockey stop. . Sometimes, when I take-off on a jump, I will slide. On landings, I will get the slide around a little, until the outside edge sticks. I am thinking of trying a deeper hollow. (I am an adult skater, adult sized).