Hi Bellaluna

I tested the 318 when it first came out in 2005. I cant remember everything about everyboat I test, but I checked my notebooks and neither my notes, nor the published review indicate an excessive occurence of backdraft ( aka, "the station wagon effect."). Note that like many boats we test, this was hull number one, fresh off the line, and the canvas hadn't been designed and built yet.Here's the review:

http://www.boatingmag.com/four-winns-318-vista

Last fall, I spent the day aboard the new version of this boat, now called the V335. This one had canvas installed, but again, I didn't notice an issue with backdraft. Here's a video about that boat, in which you can see the boat underway at speed and no spray is to be seen entering the cockpit.

http://www.boatingmag.com/VTD/2011/FourWinns/V335/index.html

Note that aboard any cruiser, with canvas up, a greater pressure difference is created and the chance for a backdraft to set up increase.

None of this is to dispute what you are saying, just giving you what I have. Some questions, so I can try to help you further:

1. Are you the original owner of this boat or did you purchase it used?

2. Has the canvas been replaced from factory original?

Looking forward to your reply.

Kevin