Imported Hair/ Groom jittering and noise in rendering

Video link - muguet perfume animation on Vimeo

Hii guys i have made this hair groom simulation in houdini and imported in into unreal engine for rendering however in the final render there is a lot of jittering and noise on the hairs, and they are not rendering properly. Additionally there are weird shadow on the hairs. i have set the spatial sample to 5 and temporal toh 20 with the screen percentage at 150%. Override antialising ticked on. Can you help me figure out how to render properly, currently they don’t even look like hairs like somekind of paper hairs :smiling_face_with_tear: