what was said above, but I'll add that if the 30lb wing is designed properly, and you're using it with an AL80, the smaller wings will just get shorter. Since they are not really any wider there is nowhere for the air to get trapped.
I own an LCD30 wing and it is brilliant on al80's despite being quite a bit more lift than I actually need, and the Torus 26 is about 3" narrower but same length. The LCD20 is no narrower than the 30, just shorter. If I was diving AL63's, then the LCD20 would be better since the LCD30 is the length of an AL80 and would be too long for use with a 63.
For me, the LCD30 is actually the most comfortable to dive since the dump valve is low enough for me to reach easily and since the intent when I bought it was to use with AL80's, I think that or the Torus 26 is a no brainer. If you're shorter and intent to use AL63's regularly, then I'd go with the LCD20 since it is the right length for that tank, but the LCD30 offers no real more drag, wrapping, or air trapping than the others because the lift is created by length, not width.
If you look at Halcyon who has a 20/30/40lb Eclipse wing, they get a lot of that extra lift with width of the wing and then you really need to pay attention on how you size it. Their shape is really nice for picking up the weight of the tank valve and first stage, but I've found it requires a more head down attitude to dump than my DSS wing does. Different strokes for different folks, but for me I appreciate the fact that DSS took the two "common" tank sizes for single tank diving and created wings specifically around that design so while the lift may be more than you actually "need" you aren't penalized for it by extra wing width.