The way you fill your cartos is the way that works best for me. I've been doing it that way for months. The other methods either take too long (dripping) or can damage the filling (syringe). To keep the carto moist, I use the VapeMate from SuperTmanufacturing.com
My carto lasts approx 4-5 days of moderate to heavy vaping. I use 100% VG organic juice from Vaperite and have had no problems. Some of the Boge 510 LR at 2.0 ohm are better made than others and those I rinse under hot water and let dry overnight to be used later on.