Flow Command frustration

 From:  Stav (STAVROS)
7807.1 
Im working version 2.52 and wondering if flow has been made any more clear in v3.
Totally frustrated trying to do some simple things.
Flowing a straight snake onto a wavy line and flowing that onto ring ( as in jewellery)

Normal direction has a mind of its own….in the first step…I assumed the same plan would map in the same direction
but it doesn't…..sometimes it maps to the front and sometimes to the back
if I select stretch option then the normal direction flips!
When I flow the wavy snake onto the ring it does the same thing….sometimes vertical or horizontal
sometimes inside and others out…..
I have to flip the normal which makes no sense to me…and an artifact is created in the centre.
What is the logic of this command?
Why are there no simple control options to control the direction of projection when using this command?

Any help with this would be appreciated so I can avoid an aneurism….:)
Thanks kindly!

s



EDITED: 11 Jan 2016 by STAVROS