Yeah i've been following yours a good bit. Actually you are a good part of the reason why I settled on my 15" XL as opposed to a Fi BL. As of right now, air was just pumping into the trunk area from the gap above my box. I'm gonna keep layering tape up top. I'd like to avoid the Foam, but may still shoot the top. This gorilla tape sure is nifty though.
Here's a vid with my xl on a blown coil, (leads stitching broke and tinsels were slapping off of cone til they gave. Only one side though) with a little over 1k running to the good one. Waiting for a recone. lol I can't wait to get everything done!