Mike...yeah, what you say is correct...I knew this but overlooked it. That is generally the case for reservoir induced seismicity. And, it would make it unlikely that tides would trigger earthquakes the way I suggested. But, I'm not so sure that you are correct about the load of a large reservoir...it could be both the load and the pore pressure. As for the small water variations at Monticello ...(if I have the name correct)...I guess it is more likely to be change in pore pressure than load...unless the quakes occurred during low lake levels. Low lake levels should drop pore pressure, making faults stronger...but less vertical load should make thrust earthquakes more likely..
As for change of stress equal on both sides of strike-slip fault...the Bar Harbor Maine and the New Brunswick Canada quakes were right on the coast, so the change in stress might be more complicated. According to John V., earth tides do not trigger quakes except for some special cases....and I do not understand the difference between loads/stresses of earth tides with that of water loads...except for pore pressure as you mention (the pore pressure is subtracted from the "normal stress"...the stress perpendicular to the fault holding it together).
anyway...good catch..
Chris