A "better system" than a filled IV bag is to place lead weight inside the floatation noodles and tape the ends of noodles closed. Like Andy does from AC Boats.
You can change or vary the position of the weight inside the noodles by adding or removing weight and by moving the weight inside the noodle till you get what you need.
Some boats run better with weight only on one side - hard to do with a IV bag especially one so big.
It's not my idea it comes from AC Boats.
Dennis you seem to have no problem criticizing me on here - if you don't want people to comment (which is what Steve did) then simple DON'T Post. Not all of us are internet experts some actually learn from running boats.
Maybe post a video or two of Your boats ACTALLY running.
Cheers
Randy