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I've also got a C11HD. I use Baader Hyperions and most of my observing is with the 21mm. If I go smaller though the seeing conditions deteriorate the image very quickly. Focus can be tricky but I have no trouble getting a crisp image with the 21mm EP. Your 5mm EP will probably never be able to be used on this scope unless the seeing conditions are exceptional.
Just make sure you loosen the mirror lock screws (don't go too far), get your focus, then slowly tighten them again (just watch through the eyepiece in case focus changes). As you move the scope to different parts of the sky the mirror can move (losing focus) so use the locking screws appropriately to hold the focus for the eyepiece.
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