Made some adjustments this weekend but still having trouble. First, the front derailleur is a Shimano Durace Triple (couldn't find the P/N). I believe the middle chainring is designed for a triple, the side edge of some of the teeth are filed down to facilitate shifting. The chainring is labeled 39/30, is this an indication that it's designed to work with a 30T chainring?

After talking with a mechanic at a LBS I tried bending the cage a bit. I also screwed back in the limit screw to the point where the it does not rub in the first three cogs. Lastly I turned the barrel adjuster about 1/4 to 1/2 turn. All this may have resulted in a little better shifting (no problem while on the stand) but still won't shift when there's medium pressure on the chain, i.e., when climbing. I'll continue to adjust the barrel screw and maybe try tweaking the cage a little more.

Doug