Any gun can be finicky, but gas more so, especially with temperature changes, different power gas etc, assuming the gun itself is set up perfectly ?.
Unfortunately a raven pistol isn't any kind of benchmark to judge gas guns by, well maybe the bad ones 😏.
So aeg is the way to go, but then you need to consider that some sites expect a dmr to be based on a real world dmr equivalent, not just an m4a1 with a barrel extension.
Also dmr fps can vary from site to site, 450/420/400/378 are all fps limits for dmrs I've seen previously.
With that in mind, once you've narrowed down your choice, you'll want to make sure the contenders have a quick change spring system, it's the easiest way to alter power output at short notice.
& don't forget it needs to be single shot, ideally mechanically incapable of auto fire, as most sites won't accept dmrs that have restricted fire mode set by mosfet.
I'm sure someone else will tell you what best out of those you've mentioned.
Good luck