Hi have this setup and with a Fox DHX Air 5.0. I run the Nixon at 70psi and the rear Fox shox at 140psi or so with 200+ in the boost valve. I weight 182lbs, probably 190lbs with gear.
I like the Nixon mostly, nice and plush, good low weight and its pretty stiff. Though I would prefer a fork with travel adjust as I find it a tall fork for low speed tight technical turns.
Not to derail the thread but those shock pressures sound way off. I'm only a little heavier than you and I run ~200 in the main chamber and 150-160 in the piggyback. I'd be running about 60% sag at 140 in the main chamber...