Allow me a moment to share a truly great article that can apply to Eventing.
As has been well discussed, I am spending more time in the jumper world. I know it's not for everyone and I am not suggesting a mass exodus from the world of water jumps, air vests, and dressage coefficients.
However I see stuff floating around the H/J world and I can see practical applications for eventing. With that in mind I suggest you read this cool article. It's Ben Maher's tips for a winning jump off. Now how would that apply. Well it's simple... our cross country courses are run against a clock. Now of course we're not running for as little time but the merits to his statements hold. A horse does best with 3 straight strides before the fence or question. That gives a horse time to comprehend the obstacle's challenge and take it on. Slicing a line closer than 3 straight strides is a dicey proposition, and while you can get away with it, it's a matter of time before you won't.
When I was rising from Prelim to Int I was taught to ride my xc a bit on tighter turns, and less pull back, balance, kick and go. It was more geared to let the horse learn to adjust themselves and let them balance at a higher rpm, balance on approach and go. I will fully disclose this was '94-97. None of the technicality we see today was in existence then. Some ABC elements, but certainly not 4 such complexes on one course.
Please have a read. Ben is on a roll right now and seems (from the various interviews and articles I have read) to be a nice horse guy.