Yowzer - those were some tough shots.
Normally, it's double action all the way, but if you're more accurate in single action, this is one of the rare times where it might be appropriate.
That said, experience tells me that misses on those very tough shots are more from nerves and rushing the shot rather than
bona fide DA trigger control issues. IOW, keep your head together, 'cause a nice light SA trigger ain't gonna help you if you don't.