Mobber wrote:
Running 9900k at 5ghz on Maximus Hero XI at vcore 1.35 in bios LLC7. Droops to 1.305 underload. Is this LLC safe? Heard conflicting things about it.

LLC7 is fine.
It's LLC8 that you need to be worried about, which is a 0 mOhm (flat) loadline. You need an oscilloscope (100 mhz with at least 20ms (or better, 50ms) measurements) so you can carefully check for transient overshoot spikes when going from idle to heavy load to idle, as those are what can cause issues, especially at high vcore/current.