Problem with Backstab Landing

I really need some advice and/or help. My 105 Rogue cannot land a backstab very often. If I run through a Gribble HA, for instance the last 6 mobs . . . not a single backstab is noted in the messages. A lot of piercing is.

Dex: 1040 incl 335 hDex
Strike through: 35/45
Accuracy: 150/300
Backstab Skill: 347/310
Piercing: 415/415
Attack: 3177
Backstab Damage Mod: 65/135 (low, but how to raise it?)

Any help would be much appreciated.

Make sure to max the Backstab Precision AA.
BS damage mod would come from equipment and is tacked on at the end of damage calculations.

How many AA's do you have? Is HDex your main stat if so that's pretty low for group gear? Maybe you the mob got pushed slightly when you pressed backstab, the fact you didn't get a backstab on the last 6 mobs of a HA is pretty vague and with it being such a low amount of mobs it could be bad rng luck or you're missing a ton of aa that are important.

Have you tried standing behind the mob? I know it's obvious, but run in to a lot of people that think the frontal backstab AA means rogues don't have to worry about position any more. Even more obvious, I assume you're hitting the backstab button and not just getting an occasional one from riposte? You're seeing the button go to cool down as well?

Frontal BS AA is like a 95% chance at max rank. So they should be seeing some.

Standing close behind mobs. Backstab precision is 2 off max. Mashing button, yes.

Assuming a normal RNG, what percentage of Backstabs should land against 105 and 104 mobs?

It's very, very high. The information here is super sketch, there's like nothing that would help diagnose the issue you encountered.

Brohg, what information would be helpful? I have been noticing a distinct lack of backstab landings for about a week. It may be related to not having ATK buffs. I cannot believe it's because I upgraded from a sorcerer's Blade to an Armsman's Shiv with accompanying augments.

Thanks.

And what offhand?

Sorcerer's Blade Piercing ID: 87953
MAGIC PRESTIGE ATTUNEABLE
Slot: Primary, Secondary
DMG: 84 Delay: 19 Ratio: 4.42 Backstab DMG: 53
AC: 62 HP: 2370 + 2/tick MANA: 2350 + 2/tick END: 2342 ATK: 24
STA: 23 + 8 STR: 10 + 10 WIS: 25 + 7 INT: 30 + 7 DEX: 25 + 9 AGI: 20 + 9 CHA: 23 + 8
SV FIRE: 45 SV COLD: 45 SV MAGIC: 45 SV POISON: 45 SV DISEASE: 45
Heal Amount: 17
Spell Dmg: 17
Clairvoyance: 28

Check plain backstabs at a combat dummy, like not a log search of combat spam. In active combat you could be getting "Backstabs" from Hidden Blade procs and ripostes / etc.

One HA and twenty dummies... Not one message containing the word backstab. I even tried a couple of weapons. Am I missing something?

then you swap the weapons go again. it could be you found a bug with the Armsman's weapon.

It shouldn't take HAs & many dummies, though. just walk up to one and hit Backstab button a couple times.

Right before major lag out, backstab message mysteriously reappeared. As I began to review log, lagged out for the night.

Marvelous -Bahdah