thanks, guys, for your very helpful and considered contributions.
went the 135.
the decider, as NJP wisely points out, was that, in a tryout in borderline wind (flukey 15), i was doing nothing else but keeping the 132 on the plane. went the wind fell in a hole, i was off downwind.
for that board, 135 is as big as they come. and none of the other boards bigger than 135 pushed my buttons.
i'm now on the lookout for <15kn gear, so if you got an SS glide or equivalent gathering dust......
cheers