Annoying trying to top off tank

[lovemysan]

Okay, when I fill up I normally don't top off. I go 3 clicks on the same pump facing same direction everytime. So the past few tanks I was out of town and filled up at 2 different places. So over the last three fill ups I slightly overfilled from the previous fill(to make sure my gaslog was honest). So I decide I'll top it off this last time because I'll be driving the fuel out of the filler neck.
Why you ask, do I do this. Because I can get all the bubbles out by rocking and bumping the car but it never seems to stop draining out. It will slowly drain the gas cap hole repeatedly. So I've done that in the past, fill till it does this 2 times. But I want better accuracy. Where is this fuel going? To the fuel vapor cannister? It is very slow to drain about 10-12 seconds to drain down to the flapper. I don't like filling this far unless I'll be driving it out because I don't know where its going. And I don't like wasting my money.

I think I may see if there is someway to install a shut off valve.