OK, so after using the 13# for a few weeks and realizing it was holding so tightly, I contacted Mantus to ask about the 8#. The response was that in conditions under 30 knots, the 8# would be great--with a 20' pontoon and 10' bimini I'm on the border of sizes.
So, always the pragmatist, I bought an 8# and 2# to try as bow and stern anchors and will be giving them the run-through this week while I'm on vacation and will post my results here. I've attached a pic of the two and will try to get one with all three so people can see the difference as I believe most people reading this may have to make the same decision (17-24' boats).
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