On a 10 foot rod a 5000 shimano will cast braid superbly through a size 16M collector guide. On a 7.5 foot rod I doubt you have the length to do that, but what you really need for that first guide is height and loop shedding design not ring size. I'd suggest you consider looking at something like these newer higher version KL guides starting with a 20-16/12-10 which I think would let you build a much lighter more responsive rod that casts about as well as with bigger guides.
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