leafs,shocks,confusion

[FOREVER71]

hey all ive just put a set of ece 4" drop leafs with 1.5" shackles.so ive got 5.5" of drop. so then i start looking for shocks.should i use a 4 or 5"drop shock? so then i start looking at the mounting wondering if i need a relocator bracket with leafs? i dont think i do. my mount has two locations ...see pic should i use the rear hole in pic to get a more vertical shock line? but that also decreases shock length. then i started to wonder why gm would put both holes in the bracket ...any ideas.....so there is my confusion.and if you are also now then at least im not the only one. but if your not any info is helpful...thanks