here are the answers to your questions :-
1) you are still qualified to join SPF even if you are in the ARMY,
but of cos the procedure will be abit complicated.... as you are
already in the SAF namelist, it will take sometime for you to be
released by CMPB if you are accepted by SPF.
2) i am sorry to know that you have fail to be even consider for an
interview. but my advice is still the same, if you do really have
interest for SPF then dont give up. cos in my records, there are
people whom tried up to 5 times before being offer an interview.
and i am sorry as i will not be able to tell u why you have
"failed" for your Feb application.
3) the only way is to carry on trying by sending applications to
the SPF. You can also consider to approached your MP and seek for
help too, if necessary.
hope to see you being a part of us soon~
cheers