Help How to do SFT on Wan2.2-I2V-A14B while keeping Lighting’s distillation speedups?

Hi everyone, I’m working with Wan2.2-I2V-A14B for image-to-video generation, and I’m running into issues when trying to combine SFT with the Lighting acceleration.

# Setup / context

Base model: Wan2.2-I2V-A14B.
Acceleration: Lighting LoRA.
Goal: Do SFT on Wan2.2 for my own dataset, without losing the speedup brought by Lighting.



# What I’ve tried

1. Step 1: SFT on vanilla Wan2.2
I used DiffSynth-Studio to fine-tune Wan2.2 with a LoRA
After training, this LoRA alone works reasonably well when applied to Wan2.2 (no Lighting).
2. Step 2: Add Lighting on top of SFT LoRA
At inference time, I then stacked Lightning LoRA
The result is very bad
quality drops sharply
strange colors in the video
So simply “SFT first, then slap Lighting LoRA on top” obviously doesn’t work in my case.

# What I want to do

My intuition is that Lighting should be active during training, so that the model learns under the same accelerated architecture it will use at inference. In other words, I want to:

Start from Wan2.2 + Lighting 
Then run SFT on top of that

But here is the problem. I haven’t found a clean way to do SFT on “Wan2.2 + Lighting” together. DiffSynth-Studio seems to assume you fine-tune a single base model, not base + a pre-existing LoRA. And the scheduler might be a hindrance.

# Questions

So I’m looking for advice from anyone who has fine-tuned Wan2.2 with Lighting and kept the speedups after SFT.

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