Try with POW mode, sRGB mode is not designed for such high values, check the GIF. Maybe you can try increasing brightness with the contrast, or even leveraging venom’s gamma settings.
EDIT: This comparison is srgb-srgb vs pow-pow, in grade there’s no pow out so the crushing in blacks is more severe with 2.85. You can try to do this with venom’s gamma settings, grade’s gamma workflow was meant to be accuracy based, btw are there CRTs with such high gamma?