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andersbq said..
...! We sail the SP63 in 37-40 knots speed in similar conditions with weed fins, sailsize 7.0 - 9.5. (Not MUF though..)
andersbq, how long is it since you sailed primbee, in the last few years we have been sailing shallow water close to shore and over the weed beds with 55 to 47deg rake fins , so far the lake top speed is held by Leo
gpsteamchallenge.com.au/sailor/view/832, on a modified f2sputnik 70lt

(see my avatar) other boards used are ca40,ca44,sp50,naish sp60,lorch 45,isonic ss49w, jp speeds,ect, one of the reasons for using the smaller boards is you can use a smaller fin, the fins I use are 17 & 18cm, 22cm cord 47deg carbon,there isn't as much weed this year so something like you suggested should be good except you will need a larger fin for the extra width ,
if you see some green & brown arrows get your self a ticket, bring your harness and fins I have the rest, ca44,jp50sp,naish60sp,custom speed, full quiver of n/prsr 4.6to7.2 ,and some carbon weed fins maybe a bit different than you have

'edit' andersbq out of interest the weed fin your using with your 9.5 is it carbon and if it's g10 what does it weigh, i'm guessing over 1kg