I agree with Ruck and Tron - guys who work with these comb issues every day. The Browning hardware IS junk. By the time I retired from the stock modification business I probably had nearly 100 of these thrown in a box from taking them out and replacing them with either my own comb hardware or the Graco replacement system. The problem is that they frequently lose their grip on your setting and either collapse or slide sideways. Spacers can stop the collapse but when it slides sideways you're screwed. If you even know it has slid sideways, where did you have it set to get it back accurately? The knowledgeable people at Browning in Utah know it's junk but are powerless to do anything about it. A theory might be that Browning paid the inventor of the hardware a LOT of money and committed to have a LOT made up and the bean counters have told the engineers to keep using them since they invested a lot of money. I don't know this for a fact, so don't quote me, but that's a possibility of why they are still using them. Outside of that, the 725 and all of the Citori based XT receivers before that are fine guns.
The Beretta Memory System is pretty junky, too. Not that they don't hold their position, but springs and nuts fly out of the comb portion of the hardware and shooters that like to change their comb height between singles and doubles have a lot of difficulty.
Kirk - If the Monte Carlo is a touch too high and up to 1/8" lower might be all it takes to be comfortable for you, ask one of these good stock guys if they can remove up to 1/8" off the bottom of the comb after they make their cut. Then you have the capability to lower it up to 1/8" if need be. No more than that much off or you'll end up with a comb that is narrower than the base and it will look bad. Or, purchase the straight stock with the factory adjustable comb and immediately have a stock guy replace the hardware with the Graco replaceable system - much more solid.
Best of luck,
Greg Hissem