IK Foot Placement and Rotation exemple (and need some improvement)

Hey !

Here its me IK Foot Setup :

Pretty good result :



Problem :
The highest placed foot is always placed a little lower the ground

http://image.noelshack.com/fichiers/2015/48/1448475847-ik-resultprob2.png

Only when left foot is on the slope, the hip offset has the right foot hit location (is absolute is higher)

Im really sorry for me bad English…