You might have the chance to eek out a lower Dolores trip but it won't flow anywhere near normal. The San Miguel is releasing 50% of average right now and the Dolores is down around 50 cfs with no boatable flows this summer above the confluence. The snowpack for that basin (San Miguel, Dolores, Juan) is already crashing hard so I wouldn't plan on much higher flows unless that region gets some major snow (which doesn't seem likely with the persistent weather patterns we have been seeing).
The San Miguel may be "unplugged" but they pull a fair amount from small diversion dams all along its course. Right now it looks like they are pulling more than 15% of its flows, which is alot considering its already low supply.
So....go soon and plan for a very low water run.