My experience with gel girths isn't too good. My horses got chafed/sores from them. I prefer fleece girths. Dover has reasonably priced fleece girths and so does SmartPak Equine. If I were you, I would go for one of those. Kincade is not that great of a brand, In my experience. Their items wear quickly and are not too comfortable. As for the idea of contoured girths, it is an excellent idea. Although the good sheepskin or fleece contoured girths cost a lot more: example: Mattes.
John 14:6 - Jesus said unto him, "I am the way, the truth, and the life: no man cometh unto the Father, but by Me."