The reason I asked about the ratio is that a higher VG proportion will often give a harder draw and cartos won't last as long. Both of your products are from reputable suppliers.
I agree with El-ahrairah. I drip down the inside wall at an angle myself, turning ans I go, a few drops at a time, and then do a "thermometer shake" every few drops. Works very well for me. Others use syringes very successfully. I think you'll find that the condom method is messier, wastes juice, and leads to faster gunking-up of the threads on your battery.
There's also something called a "Taryn Spin", named after an ECFer where the carto is attached or in something like a lanyard, and you sping it around, and the centrifugal force makes the liquid go deeper into the carto filling. I tried to find a link but couldn't. It's also more work than I'm willing to do!