I'm using the pre-installed rba build. I just added cotton. This is my fourth wick. The only one that didn't leak was the 2nd wick. I think the leaking on the 1st was due to missing chimney o-ring. I couldn't get the 2nd wick to hold enough juice after it dried out from a long (about 6 seconds or so - I'm normally under 5 seconds) vape at 29w. I kept having to drip to keep the cotton wet. The 3rd wick didn't cover the juice channel so I wicked a 4th. This 4th I put cotton in the channel but just a tad bit less than the 2nd but it's definitely in the channels. I can fill to about where the chimney and rba cap meet before it starts leaking. I get leaking if I past that point until the juice level drops back to where the chimney and rba cap connects. And it's on tight.Got a pic of ur rba build ?
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