PPC heat damage is brutal. Couldn't find anything about it in the changelog, but had some in-game chat with Kh0rn, who confirmed the tweakage.
As much as I love PPCs, they are extremely unbalanced right now. A chain-fire sequence from an Awesome easily overheated my Widowmaker Daishi to the point I couldn't even shoot back. Conversely a PPC hit to an asset carrying PPCs (or any high-heat weapon), and just fired them, is practically equivalent to a quick heat death. 700 m range flamers ain't fun (well, it is, for a while).