Your GPA & LORs/Interviews are excellent... and should keep you very competitive by compensating for "so so" ASTB scores.
mikes3, what is your rate/unit at Jax?
For Priors: LORs from present/former CO/XOs, DivOs, Supervisors are "golden".
For All: Best LORs are from present/former Supervisors, Managers, Leaders (Cub/Boy Scouts, Coaches, Professors/Teachers, Volunteer services leaders etc.), Business Execs, (Politicians...? Personally, I'd be wary of those, Nat'l approval rating ~10%)!
LORs in general, carry significantly more weight when they are worded such that the board can tell that the writer actually knows and is truly aware of your character & capabilities. On the other hand, most of the 'more important' LOR Writers use
"boilerplate" standard form letters for requesters they don't know personally, where only names/dates are changed. These are OK if it's all you can muster, but don't carry the weight of the former, and board members can tell the difference. Good interview reports also are money for priors.
Hope this helps, good luck to all!
BzB, prior ET2 (SS)