G,day Paul the biggest problem with your tree at the moment, is yes it had/ has a lot of curves in the TRUNK. But none in the branches, to create a tree that is nice the branches need to mimic the trunk. IE straight trunk straight branches Curved trunk curved branches.
It will also distract from the monotony of the S bend that is upsetting to a few here.
FYI most comercial trees that are ground grown forBonsai. have multiple bends put in them hoping that by the time they are sold they will have softened.
As most comercial Satsuki Azaleas are.
Have a look at the Chinese Elms from China, in Europe in a 15cm tree they have 4 bends.
Just my

Pup
Ps The tree that Craig has shown was created from nursery stock bought in march 2009, It was shown at the AABC seminar in Fremantle 2011. It is featured here in a post what can be acieved quick time.