I wonder what quad fins I should get for this board (7'8"x29" , fast rockerline , futures fin boxes):

I have rears with inside foil untill now but I wonder if other rears would work better

Perhaps symmetrical, 70/30, 80/20 or flat Rears?

I would also have loved to use bigger rears but the finboxes in the rear are the shallow futures....

It depends on what you want to change? more looseness, more carving, ...

On a board similar to yours (7'6" "tomo"-like), I have a similar setup as yours. (but with C-Drive fins :-) )

A good metaphor is a car: add fin grip (bigger fins, flat or concave inside foil) in front, or decrease in rear to oversteer, and the opposite to understeer.

I have a lot of C-drive fins but they don't fit unfortunately.

This is my first Tomo board and what sometimes happens is that after a takeoff it accelerates so fast that I find myself on the flat before I manage to initiate a turn.

And when I try to turn when I am not with my back foot all the way back it doesn't turn properly and goes staight on the rail

I guess I just have to get used to the board and move to the back quicker.

My board is very similar to the JP slate's only a lot thinner, and some say it is much better as a thruster perhaps i should give that a try.

sounds like you may want to work on your paddling take off stance and be back more and in semi-surf stance.

Fin wise, have mentioned recently in fin thread I rate the shapers fins. FOr me big front fins for drive and med to med-l rears for looseness. SO i run big carbon S9 fronts and S6 rears. good mix. Bigger fronts may help you get grip for your bottom turn perhaps?

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Camarillo said..
it accelerates so fast that I find myself on the flat before I manage to initiate a turn.

I think you should try 3 things, fin-wise:
- decrease the rear sizes, and increase the fronts if not sufficient: it will help the board turn once the turn is started
- use a thruster setup: a central fin helps starting the turn earlier
- if you tend to lose grip once the turn is started with a thruster setup, go 5 fins (with as small rear quads as you can find). I found out that a 5th central fin helps start thr turn. I don't know why, perhaps because a central fin is never exactly in its water lines, so does not "lock" the board as a quad does?

What you seem to experience is 2 things, or a mix of then:
- difficulty to start the turn, to "unstuck" the board from its track
- difficulty to keep the board turning

BUT, moving your rear foot more in the kickpad may be the best of all solutions :-) As you found out, dont even think of turning these boards without the foot on the pad arch.