From all your good points, this one is concluded it all.
I also checked my Actors at runtime with the breakpoint and looked inside, like ALOT of stuff in there, underestimated that. Seems like a really bad idea to save entire actor, already retreated from such a plan. Will make manually Save/Load functionality just for the properties I need.
And btw, I think yesterday I found it anyway(not sure, whole answer of this guy is unexplored area for me):
