Video upscaling 3D character videos 5s-20s long

(5060 ti 16gb, 32gb ram) I am testing FlashVSR but not getting good results (tried gemini help too). This is the default workflow in comfyui, also tried minor modifications to it using gemini's help. I get low quality video, ghosting of character, flashing all around, motion blur is terrible. My goal is to upscale 4x (to roughly 1440p) from 448p video i generated. Videos are animation style characters and backgrounds. The character has some fur, and may have some sudden movements, usually smooth motion.