Generative image systems are notoriously poor at producing legible text without significant rerolls. You'd be far better off generating a textless logo and then layering text afterwards using PS, Photopea, Krita, etc,
Models like DeepFloyd IF work in pixel space, without learning a latent space. This means they can capture much more detail, but require more computational power. This is why these types of models usually rely on creating a smaller image and then using a separate model to upscale the image.