I could be wrong but I think this is an issue caused by the way traits work/the way they have the action help text coordinate with traits. Once you attain the trait it changes the help text, the previous potency of jump 250 is overwritten with 320. It appears this way in both the job guide and in-game because the trait is technically active in both cases so you only see the updated help text/description. It *might* be possible to see the lowered potency if you enter synced content below level 54.

so essentially the short answer, I believe, is 70 potency.