Been using SMFL up front & SX for the rear. Think its a bit small a set up for this board though as its sliding around a fair bit.
I have been using the FCS HI-1 which seem to be perfect, I tried a few different combo's such as Jackson Close fronts and GX trailers and then the full S9 quad set (S7 trailers) and they were either side of what the HI's give. Strongly suggest the HI-1's.
JB
I've got the 7'6 Hokua LE.... so as it's essentially a narrower, shorter version of the 7'10 x32 hokua my comments may be of use (the fin box layout is probably the same).
One thing to bear in mind with using the hokua LE as a quad is that the rear fins are set way back from the fronts(further than a Mckee placement). They're also in off the rail a bit so are closer to a thruster in feel. This probably explains why I love my board in quad setup as its closer to a thruster and doesnt have any of the side effects of a quad with rear fins set out on the rail.
However, for me with the rear fins so far back I've kept them small (fcs G-xq) to keep it loose for my weight (70kg). One of the naish riders goes even smaller and uses the rears from the FCS TC aqualine fins which are tiny!! For me on the 7'6 I think the FCS PC5 fronts with G-xq rears are the perfect all round set so if you're on a bigger size x32 and weigh more then you're not going to want to go any smaller than that. For small waves though I'd still avoid big, swept back rear fins as it may make the board too stiff.