The twist is probably best ignored.
The limb, you want to be the bottom, and the limb that the stave wants to be the bottom are often not the same.
I've often turned a bow up the way during tillering. With out pictures it's hard to offer more advice... but I'd guess that the bow probably has plenty of extra handle section that would allow it to be turned over... and don't worry if you end up with the lower limb longer than the upper, one of my sweetest bows has the lower limb longer.
If it is a shooter now, maybe leave it alone and come back to it after some time, or after you've made some more and got more experience.
A bow is rarely ever entirely finished!
Del