So, going by your (example) numbers, our twink with twice the AP, gets 12.5% more damage for that. That's a little disheartening, and if our twink is 19, vs a target of 2k hp, the ambush damage is 480 (24%) vs 540 (27%). that's 60 damage, meaning that if you have 80 agility, adding another 80 will give you less than one point of damage per two attack power.
I'm pretty sure that the idea of twinks doing a lot of damage has been the whole reason twinking even exists, right back from vanilla, as people wished to have a lot more gear than other players, in order to give them an advantage. Is it wrong that twinks can dominate leveling players if they've put the required effort in to get the gear? I don't see anything particularly wrong with it.
But that again, isn't the balance that is being requested. Fact is, some classes are doing too much damage vs others, and this is the issue that needs fixing, not ungeared vs geared (which, isn't too far off where it should be anyway)