Ok,was working a while on this curve problem and I figured that if I get rid of these sharp corners I am able to offset and loft with no problem!
So I made the surface from two parts.
First one is made out of linear curve (EP),and the other part out of cubic curve.
Now problem is I cant use planar,cuz I have 2 curves forming one shape and if I attach with connect or blend option surface again acts wild.

Here's my problem approach,not so good but I got the loft right!