Timing/note durations

Is there any way to get choral voices to sound smoother/more flowing? The are very detached, even with slurs and with timing durations adjusted.

Even set to 98, or slurred, the notes are sung in a very detached manner.

I personally find the vocal sounds included with HALion Sonic SE to be so poor as to be unusable (and I hope that we will be able to improve them in future), but for the time being I would suggest you try using other sounds instead, e.g. perhaps wind or brass sounds. You can load another sound in the HSSE interface, but then also be sure to change the expression map that Dorico thinks it should use for that channel, so that it behaves properly. This video explains how:

https://www.youtube.com/watch?v=-WDCavA7zyw