I prefer to use less concentration than the Miracle-Gro container suggests for houseplants, because under-fertilizing only slows their growth and is easy to diagnose (yellowing leaves & slow growth).
Recovering from under-fertilizing is really easy - just give them a little more fertilizer.
Over-fertilization can be harder to detect, harder to cure (like by flushing a pot), recovery is slow ... and they don't always recover.
Less is better!