surface split - map to surface -really, really slow

Hello there,

I am using the surface slip definition and it is taking a long time to run, around 10 minutes or more, is this normal?

also, on the same model, I am splitting a deformed surface which I have generated using the "map to surface" definition.
I am getting different results depending on the place where I select my curves from, I.e if I select the curves from Rhino model I get an error on my surface (blue wire on my sketch) , if I select from my deconstruct brep definition I get the correct result (green wire on sketch) however my panel numbering will be different and if I select from my deconstruct brep definition after morphing (red wire on sketch), I get a different surface splitting- in all 3 cases I am theoretically selecting the same curves, so shouldn't I get the same result??

I hope the above makes sense, would really appreciate some help, I've been stuck on this for 3 days now...

thanks