If you did not loosen any of the lines you should not have to bleed them. The new pads have to conform or break in to the new rotors. sometimes they feel soft until you do a few hard stops, do not overheat the rotor when braking them in. Go to an open road with nobody around do a hard stop, drive for a while to let them cool. Do that 3-4 times and they should feel better if that is the problem.