I know Kill Jill is a really sub bass heavy track that goes far lower than most songs and has a lot of rumble that honestly in most scenarios dynamics can’t hold together well enough to do anything but turn to mush with the triple drop, but if more of an impact/punch oriented that doesn’t fall apart with deep sub bass rumble is your focus you might be better off going with a planar and some EQ. I don’t necessarily think you should go for the HE6se v2 if you’re looking to drive them with the A30 Pro and EQ the bass up while listening at levels that bring in head shaking rumble. You can get a lot of the same effect out of something like an Ananda Nano, but if you’re willing to kind of adjust your whole chain to cater towards a specific headphone (and I think you should get rid of the stuff now regardless of what you go with, they’re not quite relevant anymore in the current market and things have improved drastically since their releases), I have a silly recommendation.
The Mini Shangri-La with a custom pad swap from @NtraXMod is one of the punchiest headphones with some of the clearest slamming bass out there. I have been daily driving an HE6se v2 with a pad swap, grill mod, and cup/driver bracing for years now and driving them with either a Parasound A21+ or more recently a 2023 Burson Soloist 3X GT but when I had them being driven off of a Topping A90, I almost sold them and gave up. Now I have a 4 screw, 6 screw, and 3 pairs of se v2 and I still say it’s a lot easier and cheaper to get that kind of bass performance out of the new Mini Shangri-La with pads and a fat bass shelf. I know there’s some misconceptions about estats not being able to do bass well, but reviews never include pad swaps or fat bass shelves and there’s a lot more modern electrostatic headphones that can actually slam pretty hard with much faster punch than any planar that comes off as super dynamic. There’s definitely no way for the price of adjusting your system and catering to the Mini Shangs that you’re going to get that kind of bass performance and at the same time have that TOTL level of detail and separation. I know it’s a monumental overhaul to the system and the caveat of a pad swap is irritating but it’s transfomative on those headphones.
If you were to get a cheap Topping EHA5 either used or on sale that’s under $400, and you can probably get a pair of Mini Shangri-La for around or under $1000 if you talk to some dealers. Sell off that Zen DAC, they’re incapable of real punch, speed, detail, or dynamics and it’s gimping your whole system. The xBass is easy to replicate in any real EQ software and you can dial it in much better yourself.
I wouldn’t normally recommend Topping products for punch and slam, but the new Topping D50 III is one of their newer lines with their new volume control that is just vastly superior to basically any volume control out there and maintains drastically more dynamic range than literally any other volume control on the planet. That means you can leave your energizer/amp at max volume and control the volume with the D50 III and keep a lot more dynamics and on top of that all, it has built in parametric EQ that you can use to apply your EQ to any source input. It does go over the top end budget but if you sell off the gear you have now, it barely skates by and I think it’s a far more capable setup as a whole than you can get for anywhere near the price for detail, punch, impact, and maintain all that separation. The HE6se v2 will hold together better at extremely loud volumes, but you really shouldn’t be listening at the volumes that it matters (I’m guilty of it myself but I’m trying to be better about it). At normal volumes that aren’t hearing damage levels of loud, I think the Mini Shang has definitely more punch. The HE6se v2 also have a complete dog shit headband that even on very light headphones causes a hot spot on the top of your head and it’s really annoying, but the HE6se v2 are like twice the weight of the other headphones that have that headband and imo it’s an absolute requirement to swap it for an aftermarket headband.
I think if you’re going to go for punch/impact/rumble, your best bet is toss it all out and go for the Mini Shang, or go with an Ananda Nano, same pads, and still get rid of at bare minimum the Zen DAC and swap it for the D50 III and run the A30 Pro at the lowest gain setting you can at max volume to maximize dynamic range and impact. Slap a bass shelf on and walk away. I can’t stress enough that if you aren’t willing to dump serious money into an amp and also pad swap and headband swap the HE6se v2, they are not worth owning. And for what it’s worth, the Argon Mk3 are ok, but nothing all that crazy and certainly don’t have the punch of the Mini Shang, regardless of what kind of EQ you give them and they’ll never have anywhere near the detail and separation of the Mini Shang, HE6se v2, or Ananda Nano.