UP Studio 3 support generation issue

Having a lot of difficult creating a usable support structure for my print (UP Studio 3.1.2)

First issue: No support printed in layer 2 (i.e. a gap between layers 1 and 3)

Second issue: Supports floating in mid air

I can sort of work around second issue by increasing the Support Surface Expand value although the supports still don’t look amazing

BTW, supports look much better in UP Studio 2 but lose control over some parameters (e.g. number perimeters)

Unfortunately I can’t upload attachments to share config and stl

Thanks in advance if anyone can help