I was chain vaping and when I took the drip tip off to change it I noticed the carto filler looked dry so I punched a hole near the bottom and one at the top as well as having the slot, (just playing around) in the mean time I did not realize I was tilting the tank while I had the carto half out and lost a half a tank of juice....

. Anyway I out it back together, Then I noticed some flooding I took the brass connector off and took the tank out and wiped it down, put it back on and put the brass connection back on and good to go, no more flooding. If the brass connection is screwed on too tight how does that impact it? I read somewhere not to screw it on too tight as it could cause flooding....or did I dream it

Wow I would have though that one good size slit would have been enough. I typically use three holes. Two at the bottom and one past halfway near the top with good success with 50/50 juice. If I have to punch as well as slot I might stick to the punching.
Next time I am going to try and slot it up the side a little bigger than the one pictured.