Large memory VM timeout on Start?

Hi all,

I have a 1Tb RAM, dual EPYC 7543 system running Linux 5.15.74-1-pve #1 SMP PVE 5.15.74-1
(I cant update at the moment due to a project but its just an internal box with no externally accessible points)

I can start the VM below with up to 300-ish GB RAM. But times out with 400+GB and my target is to have this running with 500GB.
I checked the forum and I even tried changing the timeout from terminal (qm start 141 --timeout 400) but got nowhere.
I also set numa awareness to 1 but...

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