Good looking bike! I have had a few wickeds that I considered doing a dirt drop set-up on, and another friend that had an early FAT that he used for running aspalt laps on with dirt drops. Cool bikes for that configuration.
Is that your normal saddle height, or is the post just stuck in for the pic? I love riding drop bar mountain bikes and I always set the drop to be almost level with the saddle to keep me in the drops comfortably without being hunched-over. Being bent over is great for aero on road bikes, but just doesnt work off road..at least thats what I have found. In the end its really all about you and your size and how you fit that set-up. That looks like a pretty big frame and the extension on that stem puts it out there quite a bit. If you are a big person that has a long torso thats probably good, otherwise maybe too much reach? Those must be the newer version of Gary bars. I have a set of the older ones and they have a much shallower drop. If you lowered that seat a bit the bar to saddle orientation would work better in my opinion.
One rule of thumb I stole from someone a while back is to measure between the middle of my saddle and my grips on a bike I know fits me well and is comfortable. You can take the same measurement from the middle of the saddle to the drops and see how close you are. They should be comparable.
This stock mag pic of an MB1 with a more conventional diamond frame with drop bars is a good reference
Here are several of my past off-roadable drop bar set-ups w\sloping top tube frames.
My Vassago Bandersnatch
My Black Sheep Monster
My Fargo
These pics are just for reference, and what works for me is not necessarily what works for anyone else so take my info with a grain of salt. Do keep in mind though that these bikes got ridden on every singletrack trail I ride a conventional mountain bike on, and I never had trouble keeping pace through the rough stuff with my buddies on hardtails and FS bikes. The key for me is having the drops of the bars high enough so I am not leaning my upper body weight fully into the drops. The drops become a command center where you spend most of your time. Sorry for the long reply.