You sidestepped the question Flatwins asked .We'll I'm sorry if my interpretation or misinterpretation about RIMS mounts offends you or leaves you wanting something more. I can also acknowledge that you prefer the "before" sound over the "after" but I think we can all agree that's taste. I prefer the slight bit of choke you get from the DTS, so it's a better fit for me.
And to answer your last question. I can see that maybe an audience wouldn't be able to tell the difference in a Gretsch Energy vs Brooklyn, but for me a lot of that choice would come down to the hardware built into the kit. I'd feel much safer on stage with a kit that wasn't using cheaper/less ideal parts. Which is part of my decision to use the DTS over suspension style mounts.
“ if not to increase sustain what are RIMS for ?”
You seem very sure of yourself , I’d like to know what RIMS are for ?