YAY, you have a Kool Coat down! Those are seriously the best.
I have a shampoo by the same company as Quic Black, but it's for a chestnut, and I like it a lot. I only use it on his body, and use Mane n Tail on his legs, tail, and everything else. I figure not only is it expensive (so I don't want to waste it on his legs or tail), but I wouldn't want to put that on his face. I usually use baby shampoo for his face if I have it, if not, I water down a bit of Mane n Tail shampoo.
Also, hose him off really well when he gets sweaty. I don't trust sweat scrapers all that much, I just feel like they push sweat around and only get off what is dripping.
Riders aren't 16 and pregnant. Riders are 16 and arthritic.