Hi Simon,
To make the featured post text size bigger Go to Appearance -> Theme Options -> Design Options Tab -> Custom CSS paste the following CSS code and Click on save all changes button:
.featured-text .featured-content {
font-size: 15px;
}
and to make post text and title to the left Go to Appearance -> Theme Options -> Slider Options Tab -> Slider Options. There you can see the option Featured Text Position. Click on left option and Click on save all changes button.
Thank you!