I think Goku is shooting the kame complete wrong it should look more like that(look on his hands:
And vegeta i think he should charge up his FF in this position and he should get 2 big KI balls on each Hand and put his hands than together:
or like that:
And vegeta i think he should charge up his FF in this position and he should get 2 big KI balls on each Hand and put his hands than together:
or like that: