as follows:

11
20.869119981
30.570583143
40.282955153
50.105992649
60.029991166
70.006410183


However, in the example of complex damage mods, they are calculated in the following way:

Base Damage*(1 + (0.1*1))*(1+(0.1*0.869119981))*(1+(0.1*0.570583143))*(1+(0.1+0.282955153))*(1+(0.1*0.105992649)) etc.

This seemed to yield correct stacking figures for my calculations, even though it does not mean that the second module has ~87% effectiveness, the third has ~57% effectiveness etc.

If this were the case, the equation would be:

Base Damage*(1 + ((0.1*1)+(0.1*0.869119981)+(0.1*0.570583143)+(0.1*0.282955153)+(0.1*0.105992649))), which it does not seem to be.

Assuming it's a 15% passive bonus, it's applied to the base damage before the mods. This is how you would add in proficiency skills. As follows:

(Base Damage*1.15)*(1 + (0.1*1))*(1+(0.1*0.869119981))*(1+(0.1*0.570583143))*(1+(0.1+0.282955153))*(1+(0.1*0.105992649))