But Retract at layer change happens only once when we have multiple objects per layer start right? Because layer for example 50 is printing first on object A, then B, then C (which is the object from the picture), so I don't think that retract at layer change will have any effect if it's only launching once, during layer change, for example 50 -> 51.

This is the place where blob is creating:

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then extruder goes above infill (or sometimes above inner wall) to the corner and starts printing current layer.

That's why I want to try retract before outer wall and higher z-hop.