It's great to include logs and essential to include the exact input to the calculator, which you did, but it would be much more convenient to list for each parse the measured DPS and the calculated DPS.
I was curious if I could replicate your results and when I used the listed inputs to the
most recent version of the calculator I got these results:
Sznake vs. Eldak Howlingbear - Epic Fist + Stave of Shielding
552 seconds, 30.28 DPS
Calculator: 30.20, 30.95, 31.77, 31.68, 31.15
Conclusion: High by about 0.5 DPS
Sznake vs. Mentrax Mountainbone - Imbued Fighters Staff
553 seconds, 27.5 DPS (without fistweaving)
Calculator: 39.86, 40.14, 37.99, 37.71, 42.70
Conclusion: I must have made a mistake here? This is way off.
Bazgek vs. Corudoth - Ancient Fire Etched Flamberge
531 seconds, 70.25 DPS
Calculator: 78.65, 75.46, 73.99, 76.53, 76.26
Conclusion: Calculator is high by 5-6 DPS
Bazgek vs. Corudoth - Frostwrath
603 seconds, 64.9 DPS
Calculator: 70.50, 72.67, 73.96, 71.73, 74.39
Conclusion: Calculator is high by 5-7 DPS
Shamwowi vs. Mentrax Mountainbone - Blight, Hammer of the Scourge
3.23 DoT DPS + 2.9 White Damage DPS = 6.13 DPS
Calculator: 7.06, 6.70, 6.66, 6.37, 6.51
Conclusion: Calculator is high by about 0.5 DPS
Shamwowi vs. Corudoth - Spear of Fate
355 seconds, 32.7 DPS
Calculator: 30.8, 30.24, 31.10, 31.74, 32.17
Conclusion: Calculator is low by about 1 DPS
Does this look correct to you? For the calculator results I reran 5 times and listed the output of "Attacker Predicted Total DPS" each time.