Issue: image generation quality for stable diffusion models dropped significantly

### Description

I have been testing hardly Stable Diffusion models (1.5, 2, 2.1, and XL). The quality dropped significantly, maybe due to the fixed generation steps.

Here is an example of 2.1:

<img width="921" alt="image" src="https://github.com/premAI-io/prem-services/assets/29598954/69890297-0da4-4794-8004-8a5276a09302">
