To make it easier to adjust the weight you might try adding sand bags. Easier to set and they will mold to the structure and not make noise or be a hard spot for the hull during rough water. After looking at your pic I would suggest adding them to the area directly under your towers aft support leg. Same place I had described in the earler post.
With the sand bags you can add or reduce the weight as needed to get the least amount of weight to accomplish your goal.
P/s Most boats list to one side normally beacuse of batteries and fuel etc, adding a sand bag as ballast to the other side can level the boat out and help it run smoother in the water if you don't have trim tabs.
You may find out the 30lb each side I suggested may not be enough but may also be too much so you'll have to play with that weight. This is because without past history on how your boat rode and sat in the water this is a starting weight.
When you come up with the correct weight you may have to add weight to the bow area centerline to help plane the boat.
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1991 V-20 cuddy I/O 350 volvo duo prop, 1998 15ft Grumman 9.9 Johnson 
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