Expression Query (adding an additional expression)

Hey there

I shall try to explain this as best as possible and please refer to the images or links if the images fail to embed.

the following code http://d.pr/i/keMI allows, on a certain dgree of rotation to rotate a NULL which in then lifts the Skirt as the knee rotates towards it.

The issue im having is the one code you can see works fine with the right leg, but when im adding code for the other leg, it seems only to affect either or and not both..

I think im missing some vital CODE link between the seperate scripts but Im afraid im just not that adept at coding.. yet :/

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Both scripts work fine, tried and tested with the other leg on the backside of the skirt and therefore other NULLS for it to consider.

I just need both knees NULLS to lift the front of the skirt when the rotation reaches a certain degree..

I hope that makes sense. here are the images of the skirt to help clarify.. i hope

Right knee working http://d.pr/i/bu2s

Left knee NOT http://d.pr/i/z7E9

CODE ATTEMPTED: http://d.pr/i/dXxP

Thanks you in advance!! xxx

Images of the knee coming past the skirt layer..

http://d.pr/i/bu2s

http://d.pr/i/mMDN

Code I want to add too..

http://d.pr/i/keMI

Attempted code..

http://d.pr/i/dXxP