Your guitar probably would be better balanced with F spaced pickups, but I don't think that is your problem. What you are describing sounds more like you don't like your pickups. F-spacing would balance the level from string to string better, but that is all.
As to whether or not you need F-spaced pickups, look at the bridge pickup, and look at the strings and the pole pieces. Are they all lined up about the same? If so, then you have the right pickups. If the middle ones are lined up, but the out side pole pieces are inside the "E" Strings, then you need F-spaced pickups.
But like I said, if you don't like the TONE of the pickups right now, then getting F-spaced pickups would make no noticeable difference.
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