Im currently using Korbel but I think it lacks a bit of power especailly on the bakchand as i maily block and counter. My forehand sometimes feels a bit dead with the Korbel as well but thta just might be technique issue.
but you are ranked highly nationally, right ? sorry, what kind of power is missing if you block or counter ? If the rubber or blade is too fast the error margin on blocks will become an issue and counters are usually not done with "power" to win points, since there is quite a low margin for error. Either the ball is too high and you rather smash it or it is low and you would use a loop to give it more security by applying spin.
The whole notion "rubber x does not work with blade y" is a myth of beginners mainly because firstly its mainly subjective and if you are a noob that still needs to learn technique then you rather not think about this at all and just use something easy to play like your Korbel G-1 combination which should be good enough for everything basically.
