Since your pullet is not quite a year old she will probably not get new feathers until she molts. Typically birds start doing an annual molt after they are 18 months old, but some will do it sooner. So hopefully late this year, late summer, fall or winter, she will molt. I would use the saddle until that happens, or separate the rooster. If your rooster is the same age then he's probably still a cockerel, not technically a rooster yet. Cockerels can be very rough and driven entirely by their hormones. He may calm with age, or not. I don't keep roosters that hurt hens. Also do some observing to make sure the saddle is staying where it should during mounting. Every bird is slightly different, so your saddle may be slipping and maybe an adjustment will help.