On a relatively long design like yours, I like to put one lug on or immediately behind the c.g. and a second small lug on the forward edge of the body tube. This applies to sport designs but not to most competition designs.

My thinking: two lugs spaced apart minimizes the friction of a rocket trying to twist on a single lug, at least until it gets a little velocity started and until the top lug clears the launch rod.

I also like to touch up the tip of the launch rod to make sure there are NO burrs or rough spots to snag a launch lug.

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NAR 20602
used to be "powderburner" in another life