Doesn't matter, that main stat (STR) is the biggest boost possible outside i110 weapon WP DMG, so comparing gear isn't usless when you are comparing i110 to i90.
Side note, even my friend agreed who plays drg exceptionally well said, that unless you got perfect rng on pretty much everything that number is still inflated. That or the culling on "app" is not set up correctly. In order to hit that number you'd pretty much never be allowed to move from raf, and I do mean never. Now if you had more i110 I'd be like okay, sure that can happen >.>;
Now even on something like T8 when I had the gear similar to you, while performing perfectly (no movement) I did like 350-365. Depending on if I needed to detonate mines. T8 is essentially a dummy so on something like that I could see the number you post for T6 to be more reasonable.
I won't say anymore on this topic as I may get flamed from following posts. All I wanted to point out is that number seemed inflated and probably shouldn't be used as a basis if other drgs wanted to compare.