Success!
I got the tight little guy on this morning.
Thanks to all who so kindly gave me good advice. I bought the gun from a private party quite a while ago. I was getting light hammer strikes and FTF with my reloads, using CCI primers. Switched to Winchester primers, and no improvement. I installed the Wolff spring to see if that would be an inexpensive fix. After removing the sideplate, I noticed some very slight damage on the edges of both the plate and the frame. I believe that it may have removed by a previous owner and possibly a light mainspring installed at that time.
Anyway, I am anxious to get to range for a test.
Again - thanks to all - much appreciated.