We normally say wait 8-12 weeks between appointments, which it sounds like youv’e done so that’s good. As long as the hair coming through was still reasonably coarse as it is only your first treatment, it should be fine. Red follicles is also a sign of good treatment usually. And yes my dear, you must have a high pain tollerance if 20 joules doesn’t hurt so much 
Let us know how the shedding process goes.
Regards,
Benji