Since the beginning of time.... boats of all sizes respond dramatically to ballast placement in the hull. Unlike a truck, where the medium it operates in is not displaceable, a keel boat's operating medium (water) will displace proportionately to the object it supports. So....as I suggested in 2006... your job as skipper/boat manager is to manage the moveable ballast so the resulting trim will maximize efficiency and performance.
After taking on supplies and munitions for a long cruise, it was common for the captain(CO), first officer (XO), and sailing master (Senior Chief) to be rowed around the vessel at its anchor to check its trim so adjustments could be made before heading out. Often ballast was shifted around while at sea to improve performance as provisions were consumed.
My point is simple... even if the boat sits perfectly vertical when it comes off the factory floor.... by the time gear, supplies, crew and equipment are added there will be changes in fore and aft, and side to side, trim. The first thing you do is move the gear/ballast around to even things up. After that, if you still can't get the boat sit the way you want, then could can consider the dealer's more permanent solution.
Finally, I would be interested to hear what Catalina factory people can offer to the discussion.