I agree mostly with what others have said already. I think it's so important for owners to educate themselves as much as possible rather than just trusting to whatever 'experts' may be at hand. It's important to understand the principles & factors, because aside from what your 'experts' like, most factors of hoof health are up to you, the owner.
Chevy-the reason why he's leaving the toes long mainly in the front is from what I gather from the barn manager is that he's afraid if he trims the toes too short that the horses are going to end lame.
Sounds possible he doesn't appreciate the mechanics of what he's doing or how a hoof functions. But so saying, only got your few words & not even any pics to go on, so wouldn't want to make judgments on him without a LOT more info - but certainly questioning.
At around 4 weeks, you can see the toes flare out and there are some major chips.
For many horses, 4 weeks, sometimes even less is an optimum schedule for a trim. For most horses, 8 weeks is too long. Amount of growth depends a lot on amount of hoof function/exercise. The more miles covered, the quicker the hooves grow. I would be working to *keep* the feet in good shape, rather than allowing them to become overgrown & then 'correcting'. Therefore I'd take the flaring as a sign of overgrowth. Wouldn't leave them longer than 4 weeks. But once you learn the principles, you may find you want to learn the practice, and a good farrier should be willing to show you how to at least do a 'touch up' trim, so you may be able to keep them in shape & still keep the 8-week farrier schedule.
Sending some hoof pics & more info on his management would be helpful if you want more specific advice.