FWIW in regard to the JGC grille, I think that there is room for improvement to both those upper & lower sections, as I am considering doing this as well.
In doing some research on this, it is my opinion that the Ablaze grilles are some of the best that you could buy... Real metal in real finishes and Made in America.
Plus, JG members get discount pricing as well.
Depending on the color of your Jeep & what look you're going for...
Whether black or chrome & diamond cut or mesh, this mod upgrade is way better than the stock plastic and will really set a JGC apart from others.
With all mods, I always say that it's in the "eye & wallet of the beholder" and for my eye & money... I will call David at Ablaze when I'm ready.
I would definitely do both upper & lower to get the 'most' out of this mod.
As far as the custom height raising for the lower, I think that you just might be creating a new problem in that you may be 'calling too much attention to this lower area' of the Jeep front that is not really needed.
Not to mention what this customization would cost extra or do to mounting easily?
So, No... IMO I think the cleaner look will come from Ablaze's stock lower section.
Hey, Good Luck & keep us posted with the finished pics!