Det, SS, Crit

[T0rin]

I think you're mis-interpreting what I'm trying to say.

If you had enough DTR to increase damage by 10%, Ruin would go from 80 potency to 88 potency. You cast ruin, you get 80+8 potency all delivered at once.

But a DoT has a potency value that is delivered on each server 'tick'. So, let's take Bio for instance, which has 40 potency. Perhaps the DTR increase of 10% is delivered over the course of the spell, so 10% of 40 potency over 18 seconds worth of ticks. (6) So, 0.6666666667 potency added per tick, as opposed to 4 (10% of 40) added to each tick.

Might help explain why it seems to take a larger than 'normal' (the amount necessary to see a damage bump on non-DoT skill) amount of DTR to show an increase of +1 on a DoT, and would make the problem of truncating DoTs an even bigger issue.

The thing about truncating, is that it is almost impossible to tell the difference between potentially rolled over truncated damage, and the simple RNG aspect of damage.

[EasymodeX]

Might help explain why it seems to take a larger than 'normal' (the amount necessary to see a damage bump on non-DoT skill) amount of DTR to show an increase of +1 on a DoT,

This is completely expected.

and would make the problem of truncating DoTs an even bigger issue.

It's significantly less of an issue than you think it is even if it's true.

[T0rin]

Well, it seems significant that you could potentially need 30+ DTR to show an increase of +1 damage on a DoT, and any minor optimization of secondary stats would essentially result in no change to DoT damage. There are way too many unknowns to say for sure, but is the damage add from DTR is being spread over the full course of a DoT as opposed to applying fully on each tick, that alone makes DTR pretty weak on DoTs, and especially weak on longer DoTs.

[EasymodeX]

Well, it seems significant that you could potentially need 30+ DTR to show an increase of +1 damage on a DoT,

You need random(0..30) DTR to show the first +1 and then +"30"-ish for every +1 after that.

In addition, you have multiple DoTs with different potencies. Each would have a different cutoff for breaching truncation thresholds. As a result you would see incremental increases at smaller intervals of DTR. For example, every 5-15 DTR you'd see one of your DoTs increase in tick damage.

any minor optimization of secondary stats would essentially result in no change to DoT damage.

The stat weights you referenced lead to a major optimization of secondary stats away from DTR, on the order of ~60-120 depending on SMN itemization.

That's like 2-6 damage per DoT tick.

if the damage add from DTR is being spread over the full course of a DoT [...] that alone makes DTR pretty weak on DoTs, and especially weak on longer DoTs.

Not directly. Only from potential truncation of individual ticks.

Either way the statement is false: it's not "especially weak" on "longer" DoTs. It's possibly more difficult and less reliable to itemize for on DoTs with low potency per tick.

[Exstal]

Took me 67 INT to make Bio tick from 65 low end to 78 low end. 20 DTR seemed like nothing happened with Bio.