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5x40 is the most useful size for 18mm board.
Switching the depth of cut between edges and orientating the edges of the loose boards once you have more than a few to do is a bit of a 3d puzzle sometimes.
At some point I found an excellent tutorial describing how to set the fence to cut in the centre of 18mm boards and it all worked very well. Since then I've gone back to the face down method which has some disadvantages. If you can figure out how to always work off the edge of the board it simplifies things. You've probably already figured out that the cut off the base is not centred on an 18mm edge.
Also don't rout the end of your finger!
I also wear ear defenders because the sound of it is annoying when you're trying to think about what you're doing :)
I use mine all the time, it's one of their 'unique' tools that changes the way you can work.
Will be interested to see how quickly you get used to working upside down and back to front. Also depth setting, it's easy to go straight through an 18mm sheet.