Firstly, add a smoothing modifier to the ring, then add the figure as collision object. Meshgrabber might be better to clean up with. Have a look at this video
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Deforming Furniture Items with Figures in DAZ Studio''.
I'll second the export to Blender, deform the seat there if you can't get on with smoothing modifier.
Lastly, Hexagon isn't worth the space in memory, it's crude, it's controls are 'arse about face' compared to everything else I've tried.
if only Daz would, instead of releasing a new figure that no one really seemed to care for much, fixed that collision thing (among other issues) so that it doesn't create empty space between the chair and the figure, or at least add some sort of slider which would allow to control how much that figure is deforming the chair
as usual, there are workarounds, create a geometry shell for the figure, set the chair collision item to be this new shell, then select your geometry shell and start playing around with mesh offset value, which, luckily, can also be negative (so the shell being on the outside, starts to shrink and is in the inside of the figure mesh), start with -1 for instance, and go -2 -3 -4 etc and watch what the chair surface is doing, when it starts to look like it is in contact with the original figure, you're basically done (this may not work with smaller figure parts, like hand fingers)
there is a big BUT, sometimes the asset geometry simply doesn't play well with smoothing modifier and/or subd conversion, it may screw the asset up beyond repair (in the scene, delete and bring it in again from the library), then the only option left really is the Blender route, remesh, generate new UV layout, adjust where necessary, bring back into Daz
but, the more I learn these things about Daz, especially about figure export/import, which for mere mortals is possible only in base mesh resolution, so you can't sculpt in HD basically, the more I find myself thinking that it just ain't worth it, and I'd rather be focusing my efforts on some other product (like UE5<>Blender), the only "problem" is that I've spent probably 3-4k in last year in Daz store on assets and addons and such