Wow Sparky, I forgot how much work it was until I saw you doing it. Man, have I got a deal for you that will make your day! (well, a day in the future for you anyway)
I haven't done fillets like you showed in years. Keep using the Superfil and mix per usual... but FIRST...go buy a few of THESE:
http://www.amazon.com/Monoject-Curved-412-Syringes-5pcs/dp/B007Y8230GCut the tip back until the opening is a around 1/8" or whatever you find works for you with experience after you try it the first time.
Grab a Popsicle stick and trowel the superfil into the syringe, only takes a second to load it up.
Use the syringe to lay in a near perfect fillet like you are caulking your bathtub. You will have all 8 fillets done in the time it took you to do the one on video, and you won't have to tape it off once you get good at it, I don't tape them off anymore. Same finger/alcohol treatment to finish off.
If it isn't ten times easier I'll buy you a beer, heck, even an imported one.
Leave the unused superfil in the syringe overnight and let it cure hard. It will come out easy as a plug when you pull the plunger. I've used the same syringe on the last few planes, but I still bought a few to have on hand just in case.
EricV