R23 is a high current workload, have you checked your core/package temps (HWinfo)? It sounds a though you may have thermal throttling.
Using AI OC, 56x/43x/uncore 47
These settings net me roughly 40,700.
Dear, I have downloaded the Intel Extreme Tuning Utility and although I have tried to do some OC, the best configuration for scores of the program itself as well as for Cinebench curiously is the one that I posted, in Bios F5 and the XMP1 profile. It's like the best scores I got. Also with this, cores 4 and 5 work at 6MHZ and the rest at 5600 Mhz and we who use it for FS2020 is very good for us since the Sim uses those cores mainly, so I'm going to leave it like that and forget about it. to do OC On the other hand it is the most stable configuration to work with the PC in other areas.
All the best.
Is this a fresh install of windows? All drivers up to date?
If you already did and I missed it, apologize. But can you post a screenshot (or just say) what type of package power you're pulling during a CB23 run?