Okay so I've tried a bit with MSEGs and other stuff, had a look at the manual and for this particular behaviour I don't think it's avaible this way in Dune 2 and is something special from your synth.
But what you can do is, releasing the last (high) note before playing the low note again so you can transmit a new velocity information the way you want it to get triggered. If this results hasn't enough "bounce" for you and you work in your DAW and live playing is not so important, you could set up a second instance of Dune 2 with the same patch, increase the glide amount on the synth and only use this one for the highest and then lowest note, the jumps, while playing all other sequences in between with the original patch.
That's the best idea I have so far to get to the closest result. Nice patch by the way