You also have to understand that styles differ from rider to rider and horse to horse. My OTT horse you have to sit down more in between barrels than my other horse. If you don't, he'll throw it up a few too many gears and wont carry enough collection going into the barrels. You have to keep him balanced and driving up into the barrel, but can't jockey him up into the pocket.
My other horse, who's just started on barrels, is an easier style... more or less kick and go. Just sit down in the turns. Either way, it's not my style to get up over a horse. I like to feel like my butt is in the saddle and driving my horse up to where I need him. So that when things happen, like in this run... I'm still centered and riding. (Slipped on the first barrel on his front end, tripped at the second barrel)