As I suggested before, you need to have at least one full straight before any XLC. In your latest iteration you have two that are just after a corner and one with only half a straight. You will have missed lane changes. The worst is when one car manages to change lane leaving the flipper in the change position: if the following car misses the lane changer sensor then it will perform an unwanted lane change.
Here is my layout:
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As you can see I leave plenty of straight space before a lane changer.
My layout is on top of 9 foldable tables so it is not permanent at all.
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I have not fixed it to the table because as suggested scalex track needs room to expand.
Unless you have to put the table up against the wall with the track on it, I would not bother with fixing it to the table at all.