Just a follow up...
I've looked at the Calibre Interactive User Guide and the magnify parameter needs to be a positive number, so when I tried a fractional number, say 0.1, had an unexpected result. Looking more in depth in the documentation I could not see an mgc_eview_globals parameter that could change the grid which is used to create a calibre view schematic in Cadence, I think this is really what is needed to solve this problem. I've tried different grid settings in the layout view and did not see any effect in calibre view created, meaning I'm still getting the overlapped instances.
I did some tests and the magnify option can accept fractions less than 1, please try 0.5 or less.
For the overlapping issue at the default settings, Calibre team is looking into the issue to be fixed.
Let me know if you still have a problem.