As far as lobe seps go, my testing was similer to yours in NA motors 500/600 hp or so. I went from a 108 LSA to a 112 LSA The car slowed down a tenth or two. The 112 Was much more street friendly though, but it just didnt have the midrange that it did before.

For the OP I would not go with the 112, 110 maybe because he is using some nitrous on occasion.

Me ,Id probably stick with the 108 LSA.