I have used short cage SunTour Cyclone / Cyclone II derailleurs in two different triple setups:
1/3 step 3x5: 49-46-43 / 13-16-19-23-26
half-step + granny 3x6: 48-45-34 / 13-15-17-19-21-24
Both worked fine.
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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