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The pro is definatly 110, there was talk that they were going to stiffen it to 120 but unfortunatly that did not happen. The pro has always been 110. The very first SPK when there was just one was 90, but then the next year when they had the Koas and the Pro, the Pro was 110 and the Kaos was 100. This year they have taken what was the kaos back to a 90 flex.
As for the part regarding the tounge, it really proberly is a fit issue. As I said before we had to sretch the instep occasionally on spks we sold but we never had the problem you mentioned on any boots we sold. we did see pain in the instep on boots sold else wear and it was usally that the boots were just too big,the instep of the foot was in the wrong postion for the boot, it was not an issue with the liner or the shell, but simply a fit issue. Luckily most of the time its easy to sort out.
You must remeber that new schoolers is really not good to find decent information on products. All it takes is a few kids who got there boots online and surprisingly they dont fit well, but they think its an issue with the boot rather then that the boot simply does not fit.