As I have said I never noticed the so called tail on the Butt until it was pointed out but what I did notice and corrected on my 2023, 51 Pietta was the thickness of the trigger and it's mid bow positioning.
The butt tail profile on my 60 and 51 is apparently of the lesser reverse angle hense scarely noticeable to me from the appearance stand point and is felt more than observed.
After removal, I made a sketch of the 51 trigger, torch heated it and forged to a thinner profile front to back and re-positioned it to the rear of the trigger guard. I did heat sink the upper trigger in my vice jaws so as to retain the hardness required for sear engagement.
I have noticed this seemingly random, trigger profile difference, on both Pietta's and Uberti's for quite some time now. Photos of reshaped trigger positions at rest, half cock and full cock.
Another observation and personal preference when viewing the trigger and bow is to retain the arch in the bottom of the bow instead of flattening it out. The symmetry of the trigger and trigger guard bow should match pretty close to retain the overall esthetic appearance in my opinion hence the forge out and reshaping of the trigger lever itself.