Don't secure your borders in North Africa. Eliminate your enemies in North Africa. If you consolidate all your armies in Libya, Africa, Sicily and Sardinia and hire some mercs you can pretty much wipe the Berbers out immediately. You could probably do it even faster with the help of all the troops in Spain but I haven't tried. Once you've done that you could either disband the armies or send them to other frontiers.
Oh yeah, and get rid of all those useless navies.
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