I think you completely missed my point because you’re still hung up on the numbers. I just threw 10, 20, 30 out there to illustrate the point, not to try to be accurate.
Let’s say if I revise it now to 3, 5 and 7, would you be more happy with that? It still goes to the point that your trying to quantify the numbers is futile because it’s easier and more accurate to just try it out, than trying to quantify into numbers, for what? To crunch the numbers through some kind of formula?
Yes, ideally different domes should have new REM done. But if you’re a DIY and don’t have ready access to have REM redone, it still shouldn’t hurt just trying to switch to the bass dome and change Genie 2 to re-prescribe for the bass dome, even without REM, just to see if it makes a big enough difference to you or not. If it does and you want to stick with it, then you can try to get REM done to round it off nicely. Even if you no longer have an HCP resource to get REM done, but find a big enough positive difference, then just do in-situ audiometry on top and re-prescribe to the in-situ result. It would still be better than before, even if not as good as with REM.
If it’s actually through bone conduction, then it’d still be a non-problem and I could still have a completely closed dome and still not worry about the lows not reaching to my ears now, would I? That is, if your worry is that the bass dome with vent(s) would block out too much of your very lows that would affect your music enjoyment.