DOOOOOOOOD, when did they increase the elevation of the big D?
3,849 at the top, climbing from Mitchell adds maybe 40' vertical after Deer Flat due to the dip and you start at 200' plus...
If the OP is riding this weekend, and wants to ride early to avoid trail conflicts (aka known as rangers/tickets/etc.) then I would suggest driving to Clayton, parking at the library (Google is a wonderful thing) heading out Mitchell Canyon road, entering the park, climbing Mitchell Canyon to Deer Flat, left to Murchio Gap, descend the Connector back to the start of that climb, climb back towards Deer Flat, Climb up to Juniper (via the Widowmaker {such a played out trail name BTW}), climb the road from Juniper to Devil's elbow and then take North Peak/North Side/Devil's Elbow trail to Prospector's Gap. Look to your left. That's Bald Ridge trail. It's nice. Descend Bald Ridge to Murchio Gap (you've already been here BTW). Go right on the fireroad, past the intersection with Meridian Ridge. It's a middle (foreshadowing...) ring climb and slight descent to a water tank/horse drinking thing on your left at the head of Middle Trail. Descend Middle Trail. Hang a left at the fork, exit at the fireroad with a big grin.
Hit Heatherington on your right if you're still in need of more singletrack on your way out of the park and on the way to Ed's, or the Village Market (which still has a HUGE stockpile of Bigfoot BTW).