I would recommend using advanced task killer 2.0
This has helped me heaps free up ram. Now getting around 180mb free ram. Was using that other standard task killer and it was crap. Highly recommend the one in first sentence.
Love kanga rom. Has the screen calibration tool and I adjusted mine to green 0.837 and screen is do beautiful. Love my galaxy s.
1x LG G2 D802T 16GB White
1x LG Optimus G E975
1x Goophone I5 n2
1x Thunderbird 4s
2xHTC Touch HD2 T8585(Taiwan/China)
1xSamsung Galaxy S I-9000(Korea)