Unfortunately this attach points are needlessly complex as they were organically added and need some love/refactoring.
One thing you could try to do is to create a new attach point, that would delegate one end to one type of attach point (RTCenteredAttachPoint) and the other one to other one (RTShorterDistanceAttachPoint), or just copy/paste the code.
There is complexity if you want it to follow the shapes exactly, what kind of line it is, etc... as I said, refactoring needed. :)
Peter
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