Floor plan generator problem

Hi everyone!

So i have this algorithm that I've created so that i can generate a floor plan. 
I want my rectangle groupe to be in the center of my boundary line without getting intersected between them and without touching the boundary line. 

I've succeeded to bring them to the center and not making them intersect but my main problem here is the that they are always touching or outside of the boundary line eventhought they are very flexible. 

I use Galapagos to make them get adapted to this boundary line but no success. 

Anyone has a clue of i may get it done correctly please? 

Here's the attached file. 
Thanks in advance.