OK, then I think an Evil Twin is worth a try. The question is which one. Personally I very very rarely need more than 80 liters. Its pretty much only when it is both big, lots of current and almost no wind at all it might be nice. But then, if the waves are big you still want a smaller board on the wave so I usually go for 80 or smaller anyway.
But as I wrote, with the twin fin setup you can handle more board once on the wave. So if you often sail when the only way to get out is to really float, the ET87 will be the best choice. WHen the 87 get too big, I believe you can step right on the E70. Not much overlap, but not much of a gap either.
Tell us what you decided.