Hey,
I just went in to get my alignment done today. I used the UK specs but we had a little trouble getting the caster is spec.

Before:
Front Left /Right
Camber: -.6 / -.01
Toe: -.03/ -.06
Caster: 6.8/ 7.0

Rear Left / Right
Camber: -1.8 / -2.1
Toe: .40/ -.10

After :
Front Left /Right
Camber: -1.0 / -1.1
Toe: 0.0 / 0.0
Caster: 6.8/ 6.9

Rear Left / Right
Camber: -1.9 / -2.1
Toe: .17/ .21

He could not get the caster to go down past 6.8 and 7.0 or so. The UK spec calls for 6.45 .
Also I read somewhere that the rear toe when converted to US measurements should be closer to .33? is that correct or is it .20?

What can I do to lower the Front caster more? and should the rear toe be raised?

 

What you wound up with is good. Max caster is desirable and a little change will make no difference in feel or performance.