Unfortunately, he looks like he has a cowlick mid-mane. I had a mare like that and her mane was ALWAYS a battle, even long. Just the way it goes. Wet it, band it, leave it a couple days, take it out. It will lay down more than it is now. Repeat as necessary. Other than that, you pretty much just have to let it grow. It doesn't look bad though. You could french braid it down before you ride, if the other riders are giving you a hard time. Takes 15 min, just pull it out after. :)
"Keep a leg on each side and your mind in the middle"