You didn't say what kind of guitar you are using. You've probably already addressed the issue as long as you've been playing but playability, in terms of fast leads on an acoustic, has more to do with the guitar's ergonomics (especially neck shape and distance between the strings at the nut and saddle) and setup than with the strings.
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Kragenbrink OM Fingerstyle Adi/EIR
Boucher HG-56 000-12 Fret Adi/EIR
Martin 0000-18 12-Fret Adi/Sinker Mahogany
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