Is there a recommended heat shrink tubing size that will get over a magsafe 2 connector (bigger than the in-line one shown in this article), but shrink small enough to be tight around the wire??

Link to the flash datasheet is broken. I did a ton of Googling and could not find a link to the chip's detailed datasheet. Strangely, what SKHyinx calls a "databook" is just a list of part numbers with basic capacity and format specs and no other detailed information.