If you want the "best" aa then set it like so

shader.fx

0.65, //fxaaQualitySubpix (default: 0.75)
0.133, //fxaaQualityEdgeThreshold
0.0312, //fxaaQualityEdgeThresholdMin

float fxaaQualitySubpix = 0.60; // Default: 0.75 Raise to increase amount of blur
float fxaaQualityEdgeThreshold = 0.133; // Lower the value for more smoothing
float fxaaQualityEdgeThresholdMin = 0.0633; // Lower the value for more smoothing


// FXAA_QUALITY__EDGE_THRESHOLD_MIN
// Trims the algorithm from processing darks.
// 0.0833 - upper limit (default, the start of visible unfiltered edges)
// 0.0625 - high quality (faster)
// 0.0312 - visible limit (slower)



sharpen.h

// pour le sharpen
#define SharpenEdge 0.15
#define Sharpen_val0 1.5 (max 1.6 or its too sharp)