If I sprayed his mane down with Quic Braid, brushed it out, then put it in the slicker, would that help more if his mane was a little tackier as it dried? I usually just wet his mane with a wet sponge, and then let it dry under the slicker.. His mane refuses to lay flat otherwise, so water and a slicker isn't quite enough. I don't worry about it too much, since they're just little schooling shows, but still..
This is a recent thing, since I don't usually pull his mane. But a couple months ago, I got a pulling comb after his mane, and since there's less weight there to lay it down, it just flops up along his neck. It does look much nicer though... when it's flat.