GJShulze,
I appreciate your input, but respectfully, I have bit of experience working up these kinds of loads.
Working down reduced loads should be performed with the same care as working up max loads. It is definitely not a task for the novice reloader. I think this was the cause for your concern. If so, I completely agree and appreciate you highlighting the potential risks involved.
Fast powder plus heavy bullet is the combo required for the lightest loads possible in a semi-auto pistol. The cycling of the action is dependent upon pressure not velocity. Reducing a slower burn rate powder will induce FTFs at higher velocities. Generally, a faster powder can be reduced to produce lower velocities than the slower powder before FTF malfunctions start to appear.
I do think that the heavy bullet slow powder doctrine is a bit of an artifact from days past when revolvers were the standard. And it's definitely still true when working on the high end of the charge/pressure spectrum whether revolver or autoloader.