Hint: Moving weight from low side to high side is TWICE as effective as just placing ballast on the high side! Commodave nailed it.
The batteries are the heaviest, and relatively easy weight to move.
But before you start moving weight/adding ballast, I would recommend that you verify the location of fuel, water, and waste tanks, and how much fuel/water/waste is in the tanks. Centerline tanks you can disregard since they don't affect lateral trim.
Where I'm going with this, is that I knew a boat that had 4 fuel tanks, two large ones on either side in the engine room, and two, about 150 gallons each in the lazerette. Seller stated that the aft tanks weren't used. Investigation revealed that the port tank was about 80% full, the stbd tank was empty. Port tank contents was about half and half fuel and water. We surmised that the seller had a problem with water in the aft tank(s), and instead of fixing the problem, just stopped using them, and went so far as to disconnect the fuel lines from the aft tanks and plug them. Further inspection revealed that the o-ring from the port fuel tank filler cap was missing. . . . .
Installed a new o-ring and pumped out the tank, list corrected, but the fuel tanks weren't in great shape, so were eventually removed.
Check the little things first, and don't assume that the seller didn't overlook something simple. O-ring allowed rain and washdown water to gradually build up in the port tank, and never associated the slowly increasing list to contents of the fuel tanks.
Just a thought.