I don't know if others notice, but I believe there's variation from 'bud yo bud' of the same strain, in terms of not just effect, but taste and irritation factor. I'm always a little cautious -with every bowl - until I can tell where it's going, harshness/irritation-wise. And
@Winegums makes a good point about taking smaller draws as temps go up.
170 to 176 is not into 'high temperature' vaping territory (and nowhere near charring temp, right?), seem's kinda medium/low to me. As a heavy user, 185-190 is more usual for me, and 205 is what I'll often use with water. I can be irritated (or not!) at any point in these ranges. I happen to like those things that the higher temp releases. To each their own, as far as that goes. I tend to think that if something (mold!) were into your stash, you'd notice it more than on one bowl out of many. There's always the chance that some small foreign matter was in that one bowl...
Hey, springtime, lots of stuff in the air lately, too.