Don't really find any systematic in nerf/buff process towards snubs at all so far.
I suggest write a calculation program which will consider mean values and give proper output. This means that nerfing/buffing algorythm will remain one and ony while the coefficients for every class/ship are to be refined. This means that all tweaking will be set on gathering data and refining values of virtual parameters which are going to describe overall ship performance and its relation towards other classes.