The way I've understood the Counter+ points from reading many different threads (most are posted under the monk forum in the sticky) is that each point of counter+ = 1%. The base value of Counter is 15%. With Counterstance initialised, that increases the base by 3, to a total value of 45%. Counter gear is then stacked on top of the 45%. This would increase that total to 50%, and if you were lucky enough to have CCs on top, the total proc rate would increase to 55%. There is heavy debate about the gear that affects counterstance, but it is widely believed to merely limit the amount of -DEF that counterstance takes druing initialisation, and it is thought to have no effect on the counter proc rate...