The crucible is supposed to be a level playing field for everyone to just get in and own fools. *Level Advantages Disabled*
The Iron Banner (a Timed Event, not representing the game as a whole) is supposed to be a place where all the hard work you put into upgrading your armor and weapons shows. It's not supposed to be a level playing field. If you don't have the armor, legendaries and exotics to stand toe to toe with the plus 20's then you should get turned into blood paste and smeared across the floor. *Level Advantages ENFREAKINABLED*
Heres an example via Pokemon. You don't enter a cave you know is full of lvl 28 Zubats when your entire arsenal is 2 lvl 4 pokemon. Do you expect the Zubat to drop dead after the first attack? No. Then what do you do? You go grind the grass till you earn your pokemon levels. STAY out of the cave till you can handle going in there. The game is just as good when you were lvl 4 you just had to wait to go in the cave. The game isn't broken cause you can't wipe the floor with your army of 2 in the beginning. The Iron Banner should be the same way. Lvl 4's shouldn't even have the option to go in there else they just explode when 20+ look at them.
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However, you seem to be putting to much value behind the raw stat values, and not understanding that how the game calculates your stats may mean that level advantage is not really as significant as most players thought it would be.