syflex mimic constraint

[cryptosporidium]

hi, i got some problems with quite detailed cloth collisions and i thought i could solve it by manually model cloth position at problem spots in animation and then use mimic constrain to match that shape at specific time. but i couldnt get it work properly even in most simple cases. to be specific, i can create mimic constrain but then syflex tries to match that shape right from the first frame and i havent found any way how to control it in any meaningful way. do i make something wrong or i just misunderstood purpose of this constraint? manual is brief and does not explain how to use this. thanks for any useful info.