I am using an ego C. The little hole on the cartridge so small. Suck too hard will leak. Found that the best experience is to plug out the cartridge and suk from cone direct. But it's troublesome to plug in plug out. And have to wait for liq to fill atty after plugging back in. Tried ce4, the hole big and good, but when suck to hard got burnt taste a the liq cannot flow into coil fast enough. Anyone got better recommendation?