I hope someone else chimes in, but I think that pruning a tree that has not been prune for 10-15yrs is going to be much stress for the tree.
Cutting off branches thicker than my arm not pruning.
And I am assuming that these trees are 20-30 years old. So they are close to the end of their productive "orchard" life.
I live in the city and all my plants (4 dozen species) have a mature height of just 10ft because I dont want to prune/climb/ work unnecessarily.
The trade off is that you will have to replace more often, due to a shorter lifespan.
https://docs.google.com/spreadsheet/ccc?key=0AjpWBJwPQ0nMdEpjV1AwcVJ0dGFZbnVpVEw0RlFQR0E
Here is some of the info that you did ask for though. It is going to take 3-4 years (3-4pruning), you cant do it all in one year.
http://extension.oregonstate.edu/catalog/pdf/pnw/pnw400.pdf
Iterations are fine, we don't have to be perfect
My 2nd Location:Florida HardinessZone:10 AHS:10 GDD:8500 Rainfall:2in/mth winter, 8in/mth summer, Soil:Sand pH8 Flat