I have a fairly narrow (98.4) low volume foot, narrow heel and slender calves. The problem I ran into with shop inventories is that 60% or more of the stock in suitable flex range are designed for "comfort" and wider feet. Most others were race fit (well "fitting") but 130ish to 150 in flex. A bit stiff for my intended use and weight at 139lbs.
Byron, I hate to say this, but your Impacts may be too wide for you. They are a 100 mm last. Did you do a shell fit when you tried them at the store? My rough guideline is about 1 or 2 mm wiggle room on either side at the forefoot, with the foot centered fore/aft in the shell, for a comfortable performance fit (less for a really snug performance fit). BTW, in this regard I disagree with the Beckman guy, who states that 1 cm side-to-side is acceptable -- that is a massive gap, IMO.
It used to be true that the only narrow-lasted boots available were 120 flex and higher. But this has changed, and you can now get 98 mm boots down to 90 flex (lower for the Krypton boots). I wouldn't rule out junior race boots either. They used to be made with really crappy liners, but some of the current ones are using the same liners as in adult boots. Eg. my wife has the Lange RS110SC, with the SC meaning "short cuff" -- this is listed on the Lange site as a junior race boot, but many women and smaller guys are buying them for their performance and fit. They are identical in every way to the adult RS boots, including the liners, but just have a (slightly) shorter cuff and softer flex. FYI, she is 5'7", 130 lbs, and has no trouble making that boot boogie. To paraphrase Dan: the geometry works. In case you want to check that one out, they have a rather narrow heel pocket and slim cuff area for slender calves. Might be an excellent fit for you if the Impacts are a no-go.
Cheers, and good luck with this.
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