+1. We wanted to get a longer (24-25') boat. But, in order to keep it in the covered slip that is so nice and also very convenient, we were length limited. We physically could not turn it into the slip without making contact with either the boat or piling behind us. The marina said 20' max. So, we went with the 21SLX, which they allowed. It is 22' LOA and if it was just 6" longer it would not work. it works great for us from a space standpoint (max capacity is 12 with the SPS, and our family maximum is 10 (of which 4 are kids 10 & under). With the SPS, and a 150 Yamaha on the back, it does sit Bow up which is normal with 3 Toons). But as soon as we are under way it rides very neutral. Turns out to be a little hot rod the way it is configured.
The whole point being, that where we boat, the added length does make a big difference when it comes to allowing access to some places, while not possible with longer boats. One of the restaurants we frequent is very easy for us to dock at, but I saw a guy with a 2350 "R" model that had absolute fits trying to fit his in. So, length can make a difference! Now, having said all that, if I had bought a longer boat, and my boat fit into the slip, I WOULD NOT TRADE and lose a TON OF $$$. Our 21SLX is also a hand full in a stiff breeze, and depending on the currents, can be a real challenge. The extra foot may actually not be as meaningful as the profile your configuration presents to the wind. Our SLX has a closed fence all the way around, where some of the Gs or Rs have at least partially open fencing which is less of a "sail" then what we have. You may find that just keeping your Bimini Top closed may make a big difference.
I totally agree with what many others have said here, in that a Pontoon Boat is basically a big sail, whether towing or docking it. It certainly can not be accused of being "aerodynamic". Kind of like tying a barn door to the front of your "V" Hull, and trying to fly it into the wind. The worst time I've ever experienced was trying to maneuver a 48 foot houseboat in windy conditions. I can't tell you how many times we've had to change our plans, because where we wanted to go was just not safe or feasible to do in the weather conditions that prevailed that day.