fps_min doesn't change your frame rate.

you know how the "time" variable works, right? it's how long (in ticks) the last frame took to be processed and displayed. since a tick is a sixteenth of a second, typically "time" will equal 1 if the frame rate is 16 frames per second. if i remember correctly (it might've changed or i could be wrong) if the frame rate is below the value set by fps_min, time is automatically set at 1. typically, i put fps_min at 16, which i think is the default (but i can't remember).

sorry, but i can't help with your consisten framerate issues. all i can think of is putting fps_max at 60 (and i think the latest 3DGS version doesn't let it get higher than this because of the refresh rate of the monitor) and changing fps_smooth, which according to the manual can be adjusted to smoothen out the jerks associated with framerate fluctuations

hope this helps

julz