Blackfyre
48FPS (2x source) is better than 24fps, 60 (to original monitor refresh rate is slightly better), 3x is even better, 4x is good, 5x is better than that, 6x is the best I've tried, after 6x
It is interesting method. To interpolate first to one rate and then to blend frames to another rate. From your words:
24 -interpolate-> 48 -blend-> 60 (better)
24 -interpolate-> 60 (slightly better)
24 -interpolate-> 72 -blend-> 60 (even better)
24 -interpolate-> 96 -blend-> 60 (good)
24 -interpolate-> 120 -blend-> 60 (better)
24 -interpolate-> 144 -blend-> 60 (dropped and delayed frames)Is it what you mean? right?