Interesting concept - loosening the nut a bit does have the same effect since it lets the ALDA rise vertically from spring pressure. Never thought of that.
I personally would not want to leave it like that but I guess you could try. You need to spin the locknut a lot more than twice to get it loose. The ALDA will hit the fuel lines but should wiggle out by turning it sideways. If it absolutely won't come out due to the fuel lines, then yes you may need to loosen the #4/5/6 lines to make room. Most cars don't need that, it comes out with a couple minutes of (frustrating) fiddling.
BTW - if you're getting black smoke, it's probably a little too rich, and you'll want to tighten it down some. Power may be OK but your MPG will probably suffer, and you may just be depositing carbon internally.
