IMO people also tend to over think gearing. Both my bent and trike have triples in front. My simple method of shift is--------------shifting across the rear with each of the sprockets in front. Granny for going up steep hills and sometimes into the wind. Center ring used most of the time on the flats or easy hill. Large chain ring for down hill and with the wind. Pick the chain ring in front according to the terrain, and shift across the rear according to feel.