I think you do. Not even sure if ART will not override your support settings if you extend them too low.No "Atmos speakers" here - the height speakers are Gallo Nucleus Micro's little balls... mounted high up. they need bass support badly! reflecting Atmos speakers won't work with the steeply angled cathedral ceiling...
I consciously toned down quite a few support settings to 12 from the default of 18 to maximise localisation, but I need to do a lot of experimentation to see what ends up working best (and suiting my tastes best).
I need to do some room reorg to open up a space for the 2nd sub - and given my current results, I am not convinced that I have all that much to gain...
Still, indubitably, I will need to try it out! (it has been waiting for an appropriate bass management system for some years!)
With sub and 2 mains reaching down to 24Hz, and the surrounds reaching down to 35Hz - do I really need another sub?! (keeping in mind that I tune the bass for flat as my preference, not boosted)
If you have some graphs, that would help.