I don't think your TC tightened, I think you lost a bunch of mid-range torque. You might want to add more rear gear to get it back. This assumes that your cam swap netted you more power up high. Sometimes a bigger cam is worse for performance than a smaller cam. I've made that mistake a few times. If the cam is too large then you lose bottom end torque but you don't pick up any top end power. Then you go slower.