I have have a JL Super Frank Lean 115L x 8'0 x 30. IMO it is a good board for beach breaks and really is in its element in smaller thigh to should high conditions. It IS a groveller, so it has a flattish rocker and a generally wide planing area, which makes the board fast. BUT, when the surf gets juicy (steeper waves with more curvature to the pocket, or head high and up) this board gets squirrely and lacks the rocker to handle hollow, critical sections. Bigger fins may give you more control, but my personal experience in bigger surf is that they are not going to change this board's core dynamics, which are shaped for softer, weaker surf.
I find the stock JL quad set on the stiff side, but have really like the board with two large Quobba sides and a medium center (Rick Week's preferred general configuration). I'm 165 lb in board shorts.
Another thing: this board's profile changes pretty dramatically between the Lean / Wide shapes, as well as with length and volume. The larger, wider shapes and sizes have fairly wide squash tails, while the lean and shorter versions slim out. That also will change the board's surfing dynamics. The wider the tail, the less suited to large waves.
In the photos below, the green Frank is a Wide 9' x 32.5" x 156 and the red/yellow Frank is a Lean 8' x 30 x 115L board. I would guess that quads will generally work better in the wider tail models and thruster setups will be better suited to the lean models.