I'd not go any further for a few rides. Very slow build up. The last thing you want to do now is knacker yourself or be put off by a sore arse. Persevere with the saddle for a few rides, your arse needs a fair bit of time to acclimatise and you'd like have a similar issue on pretty much any other saddle until your arse toughens up a bit. As DC suggests, the easy old fashioned method for seat height is as he describes with heel on pedal at the bottom of the pedals travel so that the crank arm is in line with the seat tube. You should be able to ever so slightly bend your leg at the knee but if your hip rocks down or up on that side, the saddle is too high or too low.....we are talking mm of adjustment at a time here.