A few facts:
I only played with the step on 2 boats after the #1 AVH. Everything else has a 4" tall step. I brought it down to 3" on the 700 NXT #3 boat. I feel it enhanced the ride at 100.
Harry Schoell designed the DDC bottom specifically for the AT. You just don't take it and copy it and throw it in the next boat. Hence the Challenger and the AT are uncomparable.
As far as cornering or handling, I'll chase your v-bottom around any corner you can find. Sorry, let me re-phrase that. You can try and chase my step-bottom around any corner I can find.