Kits 17 and 18 are Exactly the Same

Just a quick notice, Kits 17, and 18 are exactly the same with the exception of a diamond helmet which barely makes any difference.

My suggestion is that you buff kit 18 to perhaps a Sharpness Enchant on the Iron Sword, or perhaps add a Diamond Chest Plate or Diamond Pants towards the kit to make the change more noticeable.

As of right now, I think ranking up from 17 to 18 is completely useless.

The upgrade is perfectly balanced. It's about 8-11% better than knight. If you would like me to do the math for you, feel free to ask.