Align growth effect to curve

[arcus]

Hi, 

I am currently working on a growth effect based on a simple loop and carve animation. I am struggling with aligning it to the initial draw curve though. I know its because of the way I set up the loop but can't figure out a way around this. 
In the loop I always delete all points but the endpoints to ensure I only create new curves on these end points. But doing it like this creates issues with the tangentu attribute I need for the alignment. 

Note: I used the Mops randomize in the loop. If you don't have mops its gonna look different. 

Ill include my file and a reference image how it currently looks.

Any help is appreciated, thank you!

 

NewSystem_06.hipnc