CRF-SEARCh with nvenc way off based compared to finished product score

[raysv]

Hi,
was about to check out how nvenc is fearing with HEVC now, and did two Episodes of a series to test.
Useing crf-search with min-samples 6, and with the crf its giving me, it should produce vmaf score of 95.
However, when i after encoding it run a full vmaf check on both episodes, the actuall vmaf ended up being vmaf 40.6 and 41.7.

Any snuggestions to why this might happend? The size of the files however is pretty spot on.

[raysv]

Seems like its the files that have VC1 that this problem is with, if the original is in AVC its better. However CRFSEARCH still overshoots VMAF usually with up to 2-3 points, so when ab-av1 says it will end up at 95, it end product usually is 92-93. Any tips to what to tweak to get it alittle closer?