WillC said:A healthy Coleus in good light will push out colorful new foliage and also insignificant flowers, sometimes simultaneously. Most folks pinch out the flowers to enhance the development of the foliage.
Pale foliage is usually caused by inadequate direct sunlight.
Your Coleus will grow faster and more colorfully if you keep it moderately potbound. If roots fail to integrate into the soil added to a larger pot, it may be because the roots are not yet ready for a larger pot or because the soil you used is too dense and lacking in porosity.