yes the chance of a special increases alot with higher specs.. 3* str has a 5% chance of a CB 4* i think is 10% 5* i think is 25% 6* is 50% 7* is 95% or 97% or something. as for the lows... yes you get the extra specs... so if you have 2* str and low mage, you have the same CB chance as someone with 3* str, but your damage will be slightly lower, as your "raw" strength level is lower. and yes, the invisible hp spec does count towards the strength spec bonus.. well what if you have rank 7 str and low mage? (maybe its prayer) is it at 100?