The mesorah records that the samekh in 13:30 is large (see marginal note in Artscroll and elsewhere). Yet none of the printed editions which I have consulted actually conform to this tradition. Have you come across any info on this?
Interesting point, but I don’t have any information on this. I looked around a little bit, but I didn’t see anything about it. I did hear that it is mentioned in Meseches Sofrim