I think Summoners are fine.

[Lancil_Ryner]

How much extra damage? If you know they are at least specify what it is so we calculate how much padding it is giving

Honestly people claim parsers are doing a terrible job but no one seems to specify what or why and by how much

Just as an example. I put a ThunderIII on a mob and counted each tic. I counted about 500 total damage without the initial hit. The parser was showing that I did 800+.