So I'm using Create OBject By name to create an object in the Items family. However, doing a For Each Items, Set XY does not affect these newly created objects. Any ideas on how to get around that?
Well, unfortunately you cannot simply do that (anymore, since it used to work but was removed due to being part of an actual bug). So no, you can't pick an object created by name in the very same tick with events afaik.
You can still pick the newly created object by family if you call a function with a minimal delay that manipulates it. It may be necessary to use a PV too, to avoid picking already manipulated members of that family.