Challenger SRT Hellcat Widebody
The timing only accounts for a small portion, you may be giving it too much value. This a 9.5:1 engine with an effective CR of ~14:1 under load, and that makes it prone to knock retard which negates the added benefit of more timing.The timing pull accounts for a substantial loss on this car. That’s a huge difference, and this would account for why the newer cars have been performing worse in the tests in magazines. Heat soak and higher charge air temps, along with fuel quality, absolutely wrecks output with the way the factory tune is setup on the newer vehicles.
It makes me curious what changed, because the newer engines have a number of differences that make them mechanically better, but with in real world conditions those tables you posted are a massive power difference. It really explains why the newer vehicles feel almost embarrassingly slow on hot days.
That said, the simple solution is to restore power with methanol/water injection.
In my Turbo Buick days, when running a closed loop system, I would use the "test button" on my meth injection kit to cool the slow to react IAT sensor before a run to ensure it wouldn't pull timing. These Hellcat engines would benefit from the same.
There is so much heat coming off these things it is no surprise they become saturated and feel soft. However, it is also how the power is delivered - a pre-2018 car may run harder in ideal conditions (single pass, long cool down) than a post-2017 car, but the post-2017 car may not become as fatigued once certain thresholds are exceeded and be more repeatable.