Engineer
Join Date: May 2010
Location: Bucharest, Romania, Europe
Posts: 591
Bikes: 1989 Krapf (with Dura-ace) road bike, 1973 Sputnik (made by XB3) road bike , 1961 Peugeot fixed gear, 2010 Trek 4400
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How about sprockets?
Most often for the gearing, swapping the cassette is cheaper and may solve your problem. But from 25 to 28 is not that much of a solve. If a 30t cassette may be fitted with current RD then it's the best and cheapest fix.
A triple crankest is great for hilly terrain but can get very expensive (also the brifter may not pull the cable enough for triple)