Try using a band-pass filter. This'll give a lower bandwidth for easier, less cluttered mixdowns. Try modulating the band width.
Modulate the resonance with the filter cut-off. Reduce it as the frequency increases. This'll add weight to the (quieter) bottom end while avoiding bleeding ear syndrome in the upper registers.
Use a delay (three 16ths is usually good for trance) for that spacey sound. This is probably what you're missing.
And to add a touch of bite, chuck a phaser or a flanger after the synth (before the delay - after the delay gives a slightly different effect but you might like it!) This can really lift the sound and turn it into something special. If you can, modulate the effect alongside the filter sweep. Leaving it free-running can sound really good though, and give each sweep individuality...
Finally, a touch of reverb will push it into the distance a bit, and give it stereo width and depth. You can increase this by making your delay a ping-pong style stereo delay...
Ah, fun fun fun!
T*
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