New here, and not yet a good plug builder, but....
I had a similar question about roll that I asked on another site's builder's forum, and did not get a decisive answer...
So, I cut out 6 bodies from same piece of poplar dowel, and put 3 different lips on, so that I ended up with 2 with a wide square lip, 2 with narrower flat lip with semi-circle end, and 2 w/narrower lip w/bevel.
The wider square lip definitely had the most roll.
All the bodies were pretty d@mn close in shape, weight placement, etc.
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