Using LightX2V or without? With LightX2V: CFG 1, Steps 4, sampler Euler, shift: 5.
Without LightX2V: CFG 3.5, steps 20 or 25. You are not bound to any specific sampler, unlike with LightX2V, use whatever works best for you.

@sweetmax797 ok,ty

Hi, yeah that's normal! seeds like 0 or 222222 aren't special at all, just random starting noise.
If you keep the prompt exactly the same, changing the seed only gives subtle differences, nothing crazy. T5 (FP16 just understand more complex sentences) turns the text into fixed math stuff that guides everything, so different noise mostly ends up looking pretty similar.
Play with the shift!

Wow, thank you so much, I've learned something new again! I tried it right away and it actually worked :-)

exact copy

@sweetmax797 gotcha. Thanks for the smoothmix with lightx2v at 0.23 tip. I was having issues using smoothmix having it ruin the appearance of my characters or just doing wacky shit I didn't want. Lowering the high lora like you suggested has been a game changer.

@s373ns you're welcome, SmoothMix one of the best. UniPC/Normal 6 steps and most of the loras at 0.65 works best with it.

@sweetmax797 Sorry, I'm just wanting to make sure I get it...are you saying this is what you usually do?

HIGH LORAS:
LIGHTX2V 0.23
SMOOTHMIX 1.0

LOW LORAS:
SMOOTHMIX 1.0

@SinglePage 
- base_model High [SmoothMix i2v H] -> Lora_whatever 0.65 -> Lightx2v 0.20
- base_model Low [KJ i2v] or any other low model you like -> Lora_whatever 0.65 -> Lightx2v 0.2 (if u r using untouched base model 1.0)
SmoothMix and most other base models shared here already have LightX2V merged.
You can use FP16 (high) or FP8 (low) -> higher precision is always better, lower-precision models will work with whatever signal they receive.
Regardless of the LoRA or base model, if the text encoder is FP8, prompt is limited. If the resolution is unsupported, the video will break or drift from the prompt no matter what you do.
WAN2.2 prefers resolutions under 1 megapixel, which is where it gives the best balance of motion, detail, stability.
720×1280 is supported
640×960 || 576×896 is where WAN2.2 feels alive

Portrait video sweet spot :

512×768 -> light, stable, but calmer motion

576×896 -> better motion without breaking consistency

640×960 -> magic zone

Upper safe zone (still good if VRAM allows):

704×1024

768×1024

Beyond 1 MP:

motion weakens

model will break
Tip: It's hard to memorize all those sizes. whatever size you choose, see if it is divisible by 8 like 512x848 : 512/8 = 64. 64/8 = 8. 8/8 = 0

@sweetmax797 OOOOH I've been using the Smoothmix loras, and thought you meant that. I never considered mixing low and high models! Thanks so much for all the details, this helps a lot!

@SinglePage Doesn't matter I think they're merged with the base model ( probably an older version, the merged one performs better, personal experience.) so even u use those loras, 0.8 is to high for them, at 0.8 water looks creamy, bounces are everywhere. if u r using a pure base model then 1.23 ( i did 40 videos between 1.2 to 1.33, majority of videos i liked, had 0.23 extra strength) see this workflow https://pastebin.com/TyGhSgcH

@sweetmax797 Thanks for tips and workflow. Much appreciated

@sweetmax797's account deleted? What happened?

@null Actually, 8/8=1. Just saying.

workflows are in the zip files and even added the links in the description text else you can use the ComfyUI default workflow for WAN2.2. regarding blurry videos: if CFG is 1 and steps are 4 or 6, then you need to use LightX2V LoRA, Sampler: Euler/Simple Shift:5, if you're not using LightX2V LoRA, then CFG 3.5 steps 20 or 25 as a start.

@sweetmax797 Thanks, I got it working with the Loras.