Speakers for room size that provide greater detail.

I think your weakest link is the Rotel amp. For $5K you can get some much better, including Hegel, Moon by Simaudio and Anthem. Also, that room is large; do you have acoustic treatments? With two subs, you might be muddying the sound without bass traps. Also, you state that you are 15' from the speakers; that seems possibly too far away for standmounts, but you don't say how far away from the backwall they are. The triangle rule is that the speakers should be the same distance apart from each other as you are from them. A 15 foot spread between mintors seems too large, so it might just be your current setup, which won't cost you anything to adjust. Good luck

#ghdprentice "If one is going to do a major upgrade of a system, speakers are a place to start. Get the very best speakers you can that appeal to your ear. Then upgrade the other components to support the speakers and achieve the kind of sound you want... the electronics are a big factor in how dry, or musical, or analytical or dynamic you system sound. So, if this is your plan... speakers are the best place to start."

Here I respectfully disagree with your post. The old adage "Garbage in = Garbage out" is still apropos here. A high end speaker will not sing properly if not fed the right input. The Rotel puts out a lot of power at 200WPC, but it is all AB, no A/AB. I cannot find it’s stats into 4 ohms, so I’m guessing that it doesn’t nearly double, which would explain why people describe it as dry & sterile. I have Martin-Logan ES hybrids and have listened to an amp that only had 50% increase into 4 ohms and it left them flat and lifeless. High current is where the details lie, not the WPC. To the OP, try my suggestions above, and then get in in home demo of a nice power amp (maybe even tubes/hybrid) to see if that helps.

If you do get the JA Pulsar 2’s, consider getting a Sugden AE21se to power them.  I’m using that combo right now and it’s as good as the Pulsars have ever sounded.

With your real classic 99 subs pairing with the dynaudio heritage specials is perfect. I'm getting the classic 98 subs go with mine.  They'll be beautiful together plus the sound. It's superb.