Shower temp adjustment

Not a big deal, really, but if it's an easy job, I'll go for it. Water temperature adjustment is 'jumpy' - by that I mean there is no way to get gradual changes in output. It always seems to over or undershoot what I want. The diverter is in the wall, not the spigot, with separate H/C knobs. I haven't tried replacing the washers as they shut off perfectly, but could they be the cause? TIA
- - - - - - - - - - - - - - - - - - - Easy's getting harder everyday
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Try replacing the packing around the faucet shafts. If there's any lateral wiggle, the adjustment will be quirky. While you're in there, you may as well replace the washers.
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Thanks Joe I'll check them when I get home.
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Is it possible that you have a temperature regulating valve that has been installed with the hot and cold feed reversed. This will display the exact sympton you describe.
Mark
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