I am not sure I understand your question, however I will attempt a answer.
In each armor tree there are skills that benefit that armor. I have not ever seen a skill that is a overall armor bonus no matter what type of armor you are using.
Champion points have the same type of bonuses and they are armor specific. Not over-all armor.
Does this answer your question?
I am sry, I will try to be more clear with an example:
If my light armor lvl is 8, what does boost my light armor level faster to 9 ?
I am sry, I will try to be more clear with an example:
If my light armor lvl is 8, what does boost my light armor level faster to 9 ?
The more pieces of armor you have on, the faster it levels. However, what you really want to do during leveling is go with a mix of armors so that end game you can change out your build and only respec, not grind up an armor skill which takes forever it seems end game. The goal most people have is to go either 5/2 or 5/1/1 with 5 in their main armor, and the others in a complimentary mix. The 5/1/1 is to take advantage of Undaunted Passives, but not needed if you don't use those. Of course you can use 7/7 if you want, it all depends on your build.
But, until you unlock the 5 piece passives, go with 3/2/2 for most efficient leveling of all the armors. Then go 5/1/1 until you get them all to 50 or close to it.
However, if you really want to crank armor levels, make it with the Training Trait, improve that to Blue and you will be at 50 in your main armor about the time you hit L30/L35 and you will be at 50 in the off armors before you get to L50. Note, you can get there at a decent clip at Green improvement too.