I"m assuming you're batch-sparging.
Don't worry so much about the time. With my system I've had to throttle it back halfway to keep from compacting the grain-bed. That's a stuck-sparge BTW.
With batch-sparging my first run is always longer for some reason, maybe 10-15 minutes.
Even though the concept is: drain the tun as fast as possible you gotta respect how the wort makes its way to the braid
. My grain-bed usually will remain quite loose until the level of wort drops below it's surface and I don't get any sort of channeling- which still can occur in batch-sparging. So you'll have to reach a compromise between speed, time and ease of use. Going so fast one has to fix a stuck sparge doesn't really save any time at all.
Yes try backing off on your grind. It will help your lauter. And mashing a few minutes extra doesn't hurt either.