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More watts = more amps = more voltage drop from LLC AND higher voltage requirement from increased temperature.
You need to increase the AC load line configuration to counter the increased voltage drop, but first consider whether an additional 2-3% all-core performance is worth the 20-30% higher power required.
When you say instability what does that entail? Clock speeds, temps, power fluctuations, software being unresponsive could all fall under that. Asking as I've been running the 14900k with a z690 aorus pro for weeks now with massively varied setups, with xtu ai limits at 450w, bios limits at 253w. With undervolting the even pushing all core to 6.2ghz. Ive put it through 400w load benches and undervolted till it crashed and it keeps chugging along
After usually around 5 minutes, the computer just shuts off. I thought it was the PSU, so I got a new Dark power 13 1kw PSU and the problem remains. I'm not convinced yet that it's the hardware but rather something I'm doing wrong in the bios.
So this sounds more like unstable voltages, as I would experience this when trying to undervolt or overclock without adjusting voltages accordingly. I would advise to not only set bios to defaults, but also ensure you have things like multi core enhancement disabled which might be turned on be default. Also enable turbo limits as intel por/default 253w. If you see improvements with this, it might at least rule out you having a faulty cpu/pins