If you do not use the local database on the controller (guest access for example) I would move some access points off the primary controller. Otherwise you would have to create the same username and passwords on both controllers which is really annoying. So if you have 50 access points make the primary controller the master for 25 of them and the secondary backup, and vice versa. This way you will get a better bang for your buck.
I don't worry too much about option 43 I let the APs land on the primary controller, I change the High Availability of the AP after this point as the controller information is written to NVRAM.
