Decided to try to get my Polaris Lance's catalyst complete, with only needing 39 more perfect fifth kills. While I was in the Forfeit Shrine Ascendant Challenge activity, no matter how many precision hits/kills I got, I could never get the perfect fifth trait/perk to proc. I found a spot that attracts several Taken mobs and get easy precision kills. There is a slight pause when I fire, but it is usually less than a second.