The bonus comes from the C salto skill connected to either an A or B salto skill. What happens prior to the salto does not have any affect on the bonus. So, 1 1/2 twist (C) + Front Tuck (A) = .01 bonus...1 1/2 twist (C) + Front Pike (B) = .2 bonus
There is a .1 composition deduction for only performing saltos/aerials in one direction. There are two directions defined in gymnastics: backwards AND forward/side. So, if all of the tumbling in the routine is backwards it would be a flat .1. Honestly, this is rare at L10 because the combination above is VERY typical and in just that one pass the gymnast has achieved a backward skill and a forward skill, so no composition deduction. Beam has a similar composition deduction, but is slightly more complicated. Happy to explain that if anyone cares