Terry: Take everything in proper sequence as has been stated: tuning, regulation, etc. Lastly consider voicing with the client by your side every moment. Voicing is purely subjective. I offer what may be an unorthodox method but it has worked beautifully for me. Mix isopropy alcohol 50%/50% water and after filing your hammers apply one application of this solution on the "too hard"hammers . I use a small plastic squeese bottle with a long metal spout (Schaff) and apply "only" one continuous stream from top to bottom of hammer felt at a fairly rapid pace. The only draw back is you must wait until the next day to determine the results. However in most cases, I don't have to do much needling but have the needles handy...just in case. Tommy Black Birmingham, Ala.
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