Gordon is on target with what I was speaking of. Most folks have access to 5 gallon plastic buckets. Just fill a couple/few of them till she levels out. Look at shifting some of the "stuff we always keep on board" to the port side. I always carried gallon jugs of water for drinking and cooking...and just used the water tank for showering and washing dishes. And, I had a 6 gallon hot water heater also under the sink that always stayed full. I had to move 6 gallon jugs to the port side just to offset what was always under the sink in the water heater. And...I was bad to use the head area as a "closet.." It is so easy to just put some "stuff" in there for a bit... and it added up real fast. I only used my head on one river trip that I had a guest on board. Saying that, my holding tanks were also empty. Wow, I wish I had cut them out and used that area for storage. The balance of the vessel has to or "might have been" designed with a 1/2 full mind set. Holding tanks 1/2 full, water tanks 1/2 full, fuel tanks 1/2 full... Now where we put our stuff....can change every day...and did on my TC24. And, it took me a while, but a light bulb went off in my head one night and after toping off both tanks (rarely did this due to simply not needing to carry this much fuel weight unless traveling), ...that I could use the waste tanks as a ballast. Just add fresh water, and pump her down if I needed...or...if I needed to add water (fresh water use), simply fill it with the raw water wash down as needed.
And yes, you are on target as far as getting your boat's thru hulls looked at....particuarly if she stays in the water as mine did. Now others on here are way smarter than me, but I think their is some type of moisture check that can be performed by marine surveyors... that can tell you for sure if you have a "dry hull."