That first string looks a wee bit bumpy. The rest with more hammer energy, less so. recall that that bloody valve is YOOOOOOGE, and could benefit from a significantly longer hammer throw. Getting that valve of its seat is a non-trivial affair. I wonder...
Also, I notice they're numbered...the later shots are more consistent, possibly due to the hammer's flight path getting all swept up by the previous strings. How did it like 50gr vs the 44's?
cheers,
Douglas