Justine Henin and Martina Hingis are smaller than Agnieszka Radwanska yet their games were more powerful she needs more power.
I think Agnieszka needs an even bigger first serve she needs to win some cheap points. The second serve is the glaring weakness for Radwanska she just spins it in and that's not good enough against the best players.
I also think Agnieszka can maybe attack second serves more with her backhand, maybe charge the net. But I think her mentality needs to change she cannot wait for the best players to make errors it isn't going to happen. She will have to be more aggressive like she was in that Wimbledon final against Serena last year. The forehand Agnieszka can hit through but she needs to do it more often.