Monte Carlo stocks have no place on a sporting clays course, IMO. They shoot too high for 98% of sporting targets. Floating clays above the bead is a great recipe for poor scores. Your gun needs to pattern from 50/50 to 60/40. Much higher than that is problematic.
My Perazzi MX8 is 9 lbs. I like the weight ........ in a Perazzi.
Fixed chokes are fine for sporting. You can use spreaders, like I do, on close, unpredictable presentations, like rabbits. I like fixed modified and modified. Concentrate on the targets, not on what is the most open choke you can use and still get chips. Go for smoke, not chips.