Phanriver - Also, be sure they can't insure each other through the cage bars. I have seen eyes, noses, ears and lips injured. (first hand experience with one rabbit biting the lip of the other through x-pen bars) so just be careful. Some cages are fine since the bars are very close together, but if not, you may need to get some finer net type of cover to shield one cage while the other rabbit is out.
Also, if the aggression does not die down or gets worse of the a couple of weeks, it may be better to separate them completely so they don't build up "hatred" which will make it even more difficult to bond.
Most of the time bunnies settle in and having cages next to each other helps them get used to each other (and sometimes it good to exchange litterboxes) but if this only increases their anger over time, then this could make it worse. Now they have their "enemy" pegged and when they meet - they have murder already on their mind.
You are smart to wait until at least a month after surgery as that will give time for the hormones to die down. And with these two, if they still seem aggressive then, then start with the stressor method of bonding like car rides.
When's Boofa's surgery? Is Pepper already spayed? (Sorry if you mentioned this in another post - It's late)