Realistically you have to get it on step then push the yoke forward slightly to get it off step then accelerate to a takeoff speed before pulling back again, in SP it could just be the way the buoyancy is set up on your plane preventing it from being able to essentially rotate to take off

Throw some engine power at it using Funky Trees, while using pontoons or a flat bottom like this

@Rb2h nah that’s wrong
engine

@Rb2h oh ok. Gotcha.

@Imbadatbuildingplens means you want a tag on a build
Used on teasers like this

@Rb2h what does T mean?

@Rb2h wow, very quick.

T
Also, you could decrease weight, or increasing liftScale in Overload