You can usually vape through too much juice in the chamber, but if not, take apart and use some towel/tissue to soak up excess - some tanks you can just take off your drip tip and shake your tank (while screwed on the mod, so you dont lose grip on the tank!) downwards (like trying to shake water out of a paint brush etc) to expel the excess juice through the chimney
If the leaking is not wicking, then likely the chimney or base o ring, try this (worked for me with TFV4 Mini, with RCA and usually leaking via the airflow right after filling):
Screw coil or RCA/RBA onto chimney first
Then screw bottom section onto coil or RCA/RBA
Close airflow of course, refill, reopen airflow (pulling a vacuum as you do it if you want to be overly cautious)
For me this cured my leaks and so it looks like the chimney oring is the culrpit, pobably needs to be deeper/thicker