general reamer usage:
fast feed speed (push it as fast as you can), moderate rotation speed (don't have it spinning at 10000 rpm. much slower is better).
use lots of cutting fluid
reamer should only be used for final sizing, Not "drilling". drill everything in alignment with undersized drill bit, ream to final size
edit: from avery's web page: TIP: Drill holes 1/32" undersize & use reamers for perfectly round holes & close tolerance fits on critical holes where you want a tight or snug fit of the fastener.