About the point of heavily defended warp point - are you sure guys that it is possible to have 2 warp points between 2 systems? IIRC the message says 'there already is a warp point to that system' and you are not allowed to open another one. What you can do is close the defended warp point and open the new one. This is also clumsy as when I tried this the warp point opened in the exactly same position as the closed one so it became heavily guarded again. My resolution was to open a warp point from another system and get inside
I hope I made my point that you can understand what I mean