Gary,
Of course, by running these rounds over a chrono, you will get a good idea of where you are with this loading. I have no experience with using Clays Powder, but according to my manuals, and what you describe, you are producing too soft of a recoil impulse for your handguns to function reliably....short stroking.
Your approach is the safest one, by starting out low and "sneaking up" on your loads watching for pressure signs. I hope that you will be able to find the combo of components that your handguns require. Keep us informed, and good luck.
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