Difference between Bouncy solver and regular solver in Kagaroo2

Hi all, 

I have 2 following questions in Kangaroo. Please help me

1) I am trying to implement simple tensegrity structure in Kangaroo. I am getting different solution for bouncy solver and regualr solver. Attached my GH file.

2) How to define a tension only member in kagaroo? that is unless there is tension in line object, that object should slack.