Kevin,
Some issues :
-If you have matched the vid example, congrats, the engine is sitting at the sweet transom height.
-Buy a new carb gasket which is unrestricted, check if engine was factory delivered with timing set to 25 deg, if at just 20 move timing to 25. Some engines comes factory delivered with 20 and some with 25. Is your current 25 HP the latest upgrade D2 version ?
-Once at 30 HP will have slight more top end speed and better torque to transport more weight than with previous 25.
-Water should come through water port warm enough as not to burn your hand, there is a relationship between water temp, throttle and quantity. For your peace of mind install a new thermo and gasket speciallly if that engine has been used in salt water, probably previous owner was not a big fan of flushing it after use.
-Use any good TCW-3 oil brand of your prefference, mix it at 50:1, go for a higher octane fuel and run carb dry after each outing if engine will not be constantly used on a daily or weekly basis.
Happy Boating