The jumps we used to build round by my home (bmx jumps!!) were high in clay content so they would break up in the summer if we didnt water them a bit.
Tricks we used to keep them together were coke or cheap fizzy cherry drink!! worked better than just sugar water. We'd use a roller to compact the transitions on the jumps and any flat areas that we needed to.. but you have to be carefull as if you roller it when its to wet you'll end up with holes as the dirt will stick the roller.
I'd seen some people use those vibrating compactors to better effect on flat sections than rollers.. if you have a machinery hire shop near you have a look at how much they are to hire.
erm only other kinda tip is that we also used to pour petrol on the transitions and light it to dry and bake the surface.. only really works if theres a good bit of clay in it and the earth is wet.. dry earth just breaks up quiker..
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