I always thought the LPPC was an odd development, the ER PPC existed, so developing ones that didn't need field inhibitors made since, examples of compact, high damage cannons were available, so they new the goal of something better than essentially an e-er ml was possible. So beyond not making LLs or IS ERLLs obsolete (but guess what, weapons development obsoletes older weapons, thats how things work) I never really understood its damage profile.
So here's perhaps a "next step" LPPC.
Weapon Type Heat Damage Minimum Short Medium Long Ammo Tons Criticals
Enhanced Light PPC DE 8 7 - 1-6 7-12 13-18 - 3 2