First post - hi!
I do LCY-AMS weekly. Never bother with Club: you're up and down in 40 mins.
On the Embraer, going back into LCY, I recommend booking in the back row, aisle seat. Usually I have an empty seat next to me.
When the doors at the back open, you're first off and, providing you're not shepherded onto a bus, you can get to passport control at the head of the queue.
Last Tuesday the doors on the AMS-LCY opened at 18.21, I was first off, though passport control and in the taxi rank at 18.24. Not bad at all.