You should try a few different things; everybody's different.

The first time I did MC, the SWF (Salt-Water-Flush) did nothing for me either -- very little came out. AND i had done the Smooth Move (senna) tea the night before...

Try a little exercise during/after sipping the warm salt water. Specifically, squatting, twisting, bends-- what really worked for me along with that was, periodically i would lie down, and deep massage my abdomen in a c-clockwise motion. the key is to try to physically work the liquid through your system rather than absorb it. last time i didn't do any exercises/movement and the water just...absorbed!

I read that the salt-to-water ratio is important in that your body recognizes the salinity of the water as being similar and therefore passes it through. My understanding (and I could be wrong about this) is that if the salinity of the water is not accurate, your body may not pass the briney fluid through. Therefore, I would not change the ratio of salt to water.

Of course, if I'm not correct about this, I'm sure someone more knowledgeable than I am will correct me, and I'll learn something new! :-)

What has worked for me is to use as high a temperature as i can take for the SWF. Also after finishing the SWF, I would lay on top of one of those pilates balls (not sure what it's really called) faced down and use the ball to massage my abdomen. Hope that helps!