Well that is a good field test on longevity.Glad to hear you are happy with thie R9, and trust your life on it.
Not for nothing, have you tried keeping the trigger pivot points lubed?
I know you have had this gun for a year, and no doubt know how to care for it, but these little guns tend to be neglected simply by carrying them daily.
It may also be possible that the trigger always reset slow, yet you are just now noticing it.That could be from shooting it with more confidence now, the newness worn off, and paying more attention to the function rather than how exciting it is to shoot.
If not, I'd say what everyone else is thinking, and replace the springs.