U will def want extra. The 25 hull was designed to ride a bit deeper and had less of a flat hull surface. This allowed the boat to not need nearly as much weight. A stock 25 will also have a bit more kick to it than a stock Star but once u start adding extra the Star will shape up perfectly.
You can't compare what you did in te 25 to the Star. The Star loves weight. Even if its just 500 or 600 over stock you notice it. The depth of the water you ride in also effects the Stars weight more than other boats. You may not need/ want the entire pro tour system filled but I will guarantee you will fill it a bit. The stock Star wake. Is weake for its size IMO. One of the flattest in its category. However start throwing bit by bit in there and it rapidly builds to IMO one the most legendary wakes out there ever. It amps up fast. So try adding a little by little but as mentioned snatch up those bags
Current: 2008 Super Air 210TE
Previous : 2000 X-Star, 3000lbs ballast, LTR 330, Acme 1235 14.5X14.25prop. 1200 hrs of flawless fun