Cheers dude
Did also wonder if the ali would allow more lock as there's less material there. I was planning on sticking with the composite hubs for now but can see your point ref steering response and lock.
Since I'm suffering a bit of corner entry push I think you've convinced me the 16 degree wouldn't be the way to go!
Coming from Hong Nor kits where you really only have 2 options for total caster (A or B blocks) with plastic or alloy hubs with slightly different caster angle there's a whole lot more to consider on the BOB!
Adrian