I haven't used this paper but if the results look ok it's probably just really fast, and/or your enlarger is quite bright. You can add some neutral density to increase the times for dodging and burning or to increase accuracy (it's far easier to time, say, a 20 second exposure within a few percent than a 3 second exposure.) Since this is a color enlarger, just dial in equal additional amounts of each color over and above what you use for contrast control, say +20c, +20m, +20y. You can of course use more or less as needed.