The RC dates were all conducted by the same lab. The fava beans (or as you put it “the ‘fava’ beans”, for no apparent reason) are a better example, because they had an origin obviously closer to the date of burial than, say, a tree. The main problem with RC dates on Thera has been that the soil is poor in C14 due to past volcanism (imagine that), such that stuff grown today will test hundreds of years too old.
All the rest of your reply is irrelevant to the dating of the *very small ash layer* that buried the town — supposedly during a super-eruption. And that’s what I thought we were discussing, apparently you were not. Goodbye.
I think your problem is that you do not observe scientific process. Rather than see where the data leads you have started with a conclusion and are seeking data to support it. Sounds like agenda driven junk science to me.