The New Gentleman explicitly states it's incompatible with SoS. It was built as a replacement for it. Running it with TNG is probably what's causing your NPC issue. The mod is not compatible with other mods that do the same thing namely SOS and SAM. For HIMBO I think you'd want to go for the HIMBO SOS HDT one that you specified.
https://www.reddit.com/r/skyrimmods/comments/187p04r/which_bodies_to_select_in_bodyslide_for_3ba_and/
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