You're in -30 so it would be really difficult to properly manip uke.
If you still want to go for this approach you need to try and get a little closer to uke to give him more of a push. In -9.82 you could just do some light hits to get things going, but in -30 its that much more difficult because gravity is fighting against you instead of with you.
tl;dr: Get in closer and use more power in your manip hits, although this is pretty hard good luck dude.