Hoopsnake History saving problem

Hi Guys

I have unresolvable problem in hoopsnake.

I am trying to build gh for figuring out the shortest line on a series of contour lines with hoopsnake. (Please check attached files.)

The problem is some points are running away from History Output. I can "guess" it is because I set the different number of items (contour lines) in a one hoopsnake component but I hardly fix this problem.

Please show your brilliant ideas 

Thanks in advance.

SB PARK