Problem with mothership (and phoenix)

[MissKerrigan]

Hello,

I hope I can describe this

When the mothership moves to the right and I give it a move to the left, then it makes a bend before it moves to the left (same for the phoenix)

Question: how do I make the mothership moves straight to the left (same route backwards)

MissKerrigan

 

[MissKerrigan]

(I set the turning rate to 0 in the unit-movement-stats but this seems not to work)