Fighting against Christians you get a -10 to the ENEMY morale, and on top of that even your horse archers scare them. Unless the AI has top-level units with the "encourage" trait they'll buckle.
Don't be fooled though, Hunnic armies are powerful mainly before they can attack the enemy morale rather than their raw killing power.
Want a real challenge - learn to defeat the Huns with a Roman army, much more satisfying.
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Now - about the WRE's "Constant Immigration" trait. After some experimentation I've deduced that the WRE basically operates "one level" above other factions when it come to immigration - so where normal taxes would have a neutral effect for other factions then encourage immigration for the WRE and where high taxes bring you to 0 (excluding external factors). Immigration can up to -9 PO, which high taxes causes only -6 on top of the normal - 4. What this means is that the WRE is better off grinding down immigration using governors and then setting taxes to high. With that set up you should be able to get to 0% immigration and you'll be better off PO wise, the higher taxes will compensate your the loss of immigrants and it grees up your governors to do other things.
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