Mike, your half-steps look perfect to me. What's fun about them is that you can change just the inner chainring to convert to a 1.5-step for hill work, viz:
50-47 / 14-16-18-20-23-26, similar to what you posted above
50-42 / 14-16-18-20-23-26, for a lower bottom gear, at the cost of a gap at the top and the bottom
The latter is what I normally run on my Bianchi. Capo #2 is getting a similar half-step:
49-46 / 14-16-18-21-24-26 (or ... 18-20-23-26, but I want the lower gears)
If you need a bit more range, half-step-plus-granny can be pretty cool:
48-45-34 / 13-15-17-19-21-24 (run that through your Excel spreadsheet)
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"Far and away the best prize that life offers is the chance to work hard at work worth doing." --Theodore Roosevelt
Capo: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger (2), S/N 42624, 42597
Carlton: 1962 Franco Suisse, S/N K7911
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1982 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069