Re: sitting low in front
Was the boat new? Does it seem level side to side but low at the bow?
I'm sure the boat is designed have a stern bias with a motor mounted.
It is unlikely that there is water in the tubes and even more unlikely that any water would be the same in both tubes.
The boat would normally have a motor, gas tank and a battery at the stern. probably close to 200 lbs.
By having the trolling motor and battery up front its like you removed the weight from the stern and added it to the front.
If you don't intend to have a motor perhaps you can rearrange the furniture for a better balance.