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...they will never work as smoothly as DT shifters, because there's more cable and housing between the shift lever and the derailleur.
Make certain they are firmly mounted on the stem, with no play or wiggle. Make certain that your transition at the down tube is firmly mounted and clear of any obstructions. If you did not use plastic lined, indexing compatible housings, and die drawn cables, this also makes them a little less accurate. Finally, make certain that your rear derailleur hanger is aligned, so that when you look at the derailleur pulleys, at eye level, from the rear, they appear to be on a parallel line with your rear cogs.