I think Summoners are fine.

[Kevee]

Stop me If I say something wrong.
Using the DPS and total damage, we can conclude the fight lasted 150 seconds
Using the DoT tick you got in game, let's say you do 350 DoT every 3 seconds (they tick every 3 seconds, right ?).
So that's 350 * 50 = 17 500 DoT total.
The parser shows 32 821 DoT Total.

Now if take we replace that DoT total with our theoretical DoT Total , we have :
29216 Total damage on 150 seconds = 194 DPS

If we assume the parser is right for Garuda, Ruin, Ruin II, and Fester(and why wouldn't it be? Those are all logged in the log), then you can add ~160 DPS. ~60 DPS from Garuda, ~100 from Ruin/Ruin II/Fester.

Which would fall in line with the parses DPS, but not the breakdown. Especially since in the 150 seconds Ruin/Ruin II/Fester do less total DPS because that 295 parse was after I ran out and let the DoTs bleed out.