damb i finally did it, as soon as i change the sorting out to the way i did it manually everything was aok.
sorting order is as listed;
1. sub total
2. group discount (tax false, ship false, re-cal tax standard)
3. quantity discount (tax false, ship false, re-cal tax standard)
4. discount coupon (tax false, ship false, re-cal tax standard)
5. shipping
6. tax
7. total
simple stupid allways works
also by doing this i get a bang on post discount tax number



