Thanks for the tips, and excellent idea to use the double D-rings!
I’ve gotten to the point where my new packrafts will hold air indefinitely, but I’ve built way more of them than you and my first couple of attempts leaked way worse than yours, so it sounds like you’ve done a great job. You could try to track down where the air is coming from using a 50/50 mix of soap and water painted on with a brush, but it may not be worth your time for such a slow leak. When you’re actually using it, the temperature will affect the air pressure much more quickly than a leak that slow.
Regarding the glue-brain thing – I definitely recommend applying Aquaseal/Seam Grip outside if the weather cooperates, and at least in a well ventilated room. I do it in my garage with the window open and then get the heck out of there. I also try not to do a whole bunch of seam sealing all at once – maybe one or two seams and then leave it overnight.
Cheers!