You're lucky. Much as I've tried, I just can't get those visco rockets to work.
Skipping back a bit to these visco rockets...
These things are really cool to me, being easily thrown together.
I found that about any visco fuse will actually work, they all just produce different thrust characteristics. You will need to try using 6 strips of fuse to start at about 1" each, then try 7, 8, 5 etc. I use slightly thicker fuse.
First of all, the tutorial in the link on page 1 states that you should make these nice little twisted nozzles and tie them with string. I've found this idea really to be useless and inconsistent. Paper burns away rapidly and loses strength. So does what I recommend but at a much more consistent rate from rocket to rocket.
So what do I say? Use the hot glue gun you already have out to make the nozzles. You simply make sure the main fuse is centered in the bunch. Squirt hot glue all around it, about 1/3" in length. Hold the fuse perfectly centered as the glue hardens.
The hole from the fuse burning through the glue initially gives a nice small hole for higher pressure. The glue erodes quickly but the motor also burns out quickly.
If you make them consistent with strong rolled paper cases, they have some oomph! Easily enough to lift a few more grams.
One other thing, these have a tendency to spit out the nozzles with a pop once you push their limits. Soak Ca glue into the paper ends, so that the paper becomes a solid plastic-like material bonded to the nozzle and plug. This way the nozzle is not bonded to one layer of inside paper, rather the whole roll.