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RFE is a result of a process of investigating your case, first your case should be complete for adjucation( which means all the documents and info should be available to the adjucating officer, which includes FP) by going through FP you are completing the phase of completeness for adjucation.
Then the process of adjucation starts where they will look at your documents and make a determination if it is lacking anything or any further documents are necessary to approve the case. If none is identified then your case is approved.
Regarding the cases transferred to Baltimore I found quite a lot of cases transferred to Baltimore some even before FP, that might be for some fundamental reason that is prevalent in the application which requires a personal interview, most cases like RIR,NIW which are not clear cut like Labour certification is forcing the INS for a personal interview.
Hope this helps