Hey guys

I've recently been trying this JC deep 8'8 x 32 x 135l board as a quad but it is like nothing i've tried before!
I've been riding shortboards and surfing for years (5'9 is my custom) and also as a quad, but I have tried anything as fast as this JC board as a quad. It just takes off down the line and half the time I come off the back of it or can't really get the rails to engage when I step back and try turn off the tail.

It just seems way too twitchy with the current quad set up.
I'm only 69kg so I wondered if I might actually be too light for it, or too light to properly get the rails to engage? It's only around 7kg so very very light.

Would love to run a bigger single fin but limited with the standard futures box.
What do you guys suggest?
Run thruster?
Run a nubb fin with the quads?
Run bigger quads?