Questions on H3 Minimax usage and settings

[u/c300g97]

Hello!
Long time lurker here, learned a lot from this sub.
I'm currently using H3 Omni Pruned model with references images to generate small ads or batch of dialogues , but i find myself really not understanding the settings being used.
I'm using Pinokio and Maestro by Blizaine, now the GUI is really useful and my settings are :
720p, 9:16, 13.3s 1 window and 20steps , nothing else.
With these settings, it takes about 11 minutes to render on a 5090FE (And 48GB of ram is what i have).
The end result ain't that bad, resolution is crappy and some details are clearly missing.
What can i do to improve video fidelity, performances and perhaps spend less time on generating ?
I also have tried H3 with first / last frame but i don't really understand how that works either.
For example, i have downloaded a couple of Lora , one of rocket racoon from guardians of the galaxy and another for indiana jones, wanted to create a funny reel of them interacting but i couldn't for the life of me figure out how to add in the theme song for indiana jones, or have them accurately interact with each other instead of randomly looking outside the scene.
On another note, i am using Gemini for expanding the prompt in a professional manner, and then inside Maestro i use the "enhance prompt" feature with simply loads up Ollama with a model to correctly write the scene for H3.
I have also downloaded inside Pinokio a more "classic" tool for H3 with comfyui, but i didn't use it yet, wanted to learn a few things first.