Until last year you could fly at Pismo Beach, The last time I went they had a No Drone sign posted on the little entrance shack! it was fun while it lasted.
Same as RID (Pilot location, drone location and flight path, drone model and serial number, heading, elevation above launch point, drone distance from controller, speed, distance from detector) plus a few others.
Thou shalt not cast aspersions on Mother Nature's color of green, I sayeth verily unto thee.
On a slightly less biblical note, your observation that the battery cell voltages' variation is within reasonable limits amounts to an assurance that...
Besides Palomar Mountain State Park (which is not where the guy was flying from), there are numerous desert state parks that also do not allow drones to be flown from within them, including Anza Borrego, Salton Sea, etc.