I've been on the water for year, and was a whitewater guide at one time in the 90's; and have a number of dry-tops over the years. I must say, "the quality of the jacket is second to non". The instruction video I found on Youtube was just what I needed to make the necessary gasket adjustments. As instructed, beware and only cut one ring at a time. I followed, and now have a perfect fit.
Even better I found it on sale for just $272. on BackCountry.
BTW, Backcountry is the best company I've bought from anywhere!