Dynamic Blocks: attribute position

[Metalgooze]

Hello,

I am trying to create an arrow symbol to use in 4 directions.
I managed, through a lookup table, to orientate the block and attributes in the right direction.
The only thing I can't fix is that my attribute stays at its orignal position.

I know you can fix this with polar stretch but I can't seem to get it right.
Help is needed. The end result should be like shown underneath.


A second question for when my attribute stays in place.
Is there a way to automaticaly change the justification?
The length of the value may vary a lot zo justification is important.

Justification is set on the left side and this is OK for RIGHT and UP position.
For the other two, justification should be on the right side.

If anyone could explain me how to solve these questions (and most of all make me understand how to do it).

Thanks in advance,