Stimulated Implant +5 percent to mastery inaccurate

[MasterAtin]

Although the stimulated implant is universal in its applicability on all classes, my main is a Scoundrel/Vanguard.  I either heal, dps, or tank on it.  Don't worry about telling me I have the wrong implant for either class.

 

Anyways, here are my stats in-game vs my own math (assume implant is 334 unaugged, no other gear changes):
-With implant, no stim = 16,197

-With implant, proficient stimmed = 16,969

-With implant, versatile stimmed = 17,259

 

If I'm mathing correctly...

With the proficient stim (accuracy/critical rating) activated, my mastery buff from the implant bonus should look something like this:

1.05*16,197=17006.85

or

.05*16,197=809.85.  809.85+16197=17,006.85

With the versatile stim activated (mastery and power) activated, my mastery buff from the implant bonus should look something like this.

1.05*16,475=17,298.75

or

.05*16475=823.75.  823.75+16,475=17,298.75

However, referring back to my first set of numbers, my mastery stat with proficient stim 16,969, and my mastery stat with versatile stim is 17,259.

W/ Proficient:  17,006.85-16969=37.85.

W/ Versatile:  17,298.75-17,259=39.75.

Additionally, the difference between the 37.85 and 39.75 is about .05 (or 5%)

It's a small difference, and I'm not ready to die on any hill about it, but I'm just curious if anyone knows why the numbers in-game aren't adding up to the ones I calculated irl.

 

If my math is bad, be gentle.  

 

[ThanderSnB]

Maybe it doesn't stack with some mastery bonuses?

Some mastery bonuses it might not stack with:

• Datacron mastery bonuses
• Legacy class mastery bonus
• Base mastery from leveling up

I'd test datacron mastery first.