Just wondering if each rank of a weapons skill level has the same additive value as the previous one. I know the base % increase for rares, SR, and SSR are all different, but is in bonus value added per rank the same for all three? For example is getting 3 SR weapons to rank 3 the same as getting 1 SSR weapon to rank 7 (+6 total either way, less mats for the 3 SR weapons)? Just finding it hard to level some weapons multiple times due to not having that many (S)Rs at once.