So, I think there's an important factor being missed in this discussion when phrases like t1, t2 power get thrown around. Jab may be in the first spot in the power list for Super Strength, but in terms of melee set balance, it is not, in fact, a tier 1 attack. Punch is the t1 attack in Super Strength. In most melee sets, a tier 1 attack has a recharge (and corresponding damage) of 3-4 seconds, and a tier 2 attack has a recharge of 5-8 seconds. With their respective recharges, Jab, Punch, and Haymaker are all effectively one tier lower than their position in the list of Super Strength powers would imply. When you hear it said that the powers in Super Strength are weaker than they should be because of Rage, this is precisely what that means.
With this in mind, the comparison to Fighting pool powers doesn't seem so stark for Super Strength. Boxing and Kick are both effectively t1 powers, and they don't pull ahead of Punch, Super Strength's "true" t1, until all 3 Fighting attacks are owned. The same is true of Cross Punch and Haymaker. In any other comparison between sets Rage would easily make up the difference, but in this case the other powers are pool powers and so they get the benefit from Rage as well.