It seems like using both is a bad idea...
23 - 30 FPS is fully playable. Anything less than that will give you a slideshow effect. It'll get worse as your FPS go down. I'd say you numbers are good. Anything more than 30 FPS isn't perceivable by the human eye.
Ugh, you must not have read the thread that Illius linked to above.
Dragoon Wraith talks a bit about it. I can easily see the difference between 24FPS film and 60FPS soap operas (though I don't watch them, haha). That whole "FPS and the human eye" thing is basically bogus, and not factual. I can actually see the difference between 24FPS and 30FPS. Some sitcoms have been filmed at 30FPS and it makes their motion funny.
I can also see the difference between 700FPS and 100FPS quite easily. It matters how drastic the change is. I wouldn't be able to tell the difference between 700FPS and 650FPS in any situation, though.
(Edit: And this has to do with how well the screen refresh rate goes into the FPS. 700/60 is a lot better than 100/60, and thus you notice the missing frames on the lower framerate better)
For me though, I can barely play at 24FPS, it's just too jerky. Unless I turn on the forward motion blurring shader, which helps blur the edges where you see the separate frames the most.