I am going to paste the post of another user, takkom, that was born from a post I started on supposedly wrong weapon tables. He did a good in game tests that might show hidden Clan nerfs to weapons. So this post is not about whether there should or should not be nerf to Clan mechs, it's about trying to bring out if there are any.

i just did some tests myself on PTS forest colony with a kgc 0000:
1x LPL: 11%
2x LPL: 25%
3x LPL: 39%
4x LPL: 70%
1x med las: 4%
2x med las: 12%
3x med las: 20%
4x med las: 28%
1x ac10: 5%
2x ac10: 11%
2x ac10 + 1x med las: 16%
2x ac10 + 2x med las: 24%
i tried a bunch more...bottom line - the numbers added up fine, except pulse lasers looked a bit different than other lasers due do their different build-up and dissipation over time mechanics.
next, i hopped on a warhawk to compare clan weapons
1x LPL: 8%
2x LPL: 23%
1x MPL: 3%
2xMPL: 12%
1x ERL: 7%
1x ERM: 3%
1x ERS: 0%
1x ERPPC 23%
1x ERM+ ERPPC: 27%
1x ERM + LPL:19%
1x ERS+ ERM+LPL+ERPPC: 49%
1x ERS+ ERM+ERL+ERPPC: 47%
(...)
p.s. it also takes 7x cERLg shots and 6x cLPL shots to break the arm armor of a CPLT-A1 --- testing grounds fail?
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My bottom line: is there more heating and less damage going on here? Eager to hear your comments.
Z