It's not an uncommon problem, because some people (especially with smaller hands) have trouble with the distance and effort involved in the "throw" of the big lever on the left.
Sometimes, though, the cable indexing just doesn't work the same under load as it does on the stand. Other setups are a little more finicky about what cog you're in in the rear when you make the shift.
You can try shifting when you're in a cog that is nearer to the small end. You can also try tightening the cable for the front derailleur some and see if that helps. If none of that works, then it might be that you'll be better off with the bar end shifters.



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