Cusp - A point of Transition, a turning point, the first day (or) the last day of a sun sign. If you were born on a Cusp in terms of astrology you will have the advantage and energies of your primary sun sign (i.e your own sign) and the transition sun sign. Influence of 2 sunsigns/Zodiac signs is bound to happen. Having said this there is a possibility of variations in the horoscope due to changes in the time zones, leap year of cusp, and other reasons.
Natal Horoscope - Can find a solution to this and considered more accurate. Though the regular horoscope tells about your innerself with details. It is a basic interpretation considering the position of the Sun. Natal chart gives a clear picture and insights into your characters. It is recommended to have your Natal horoscope read than your regular basic horoscope.
To address this issue www.Findyourfate.com has come out with a much demanded service to do Personal Natal Reading. Human prepared Natal Horoscope chart - Reading and analysis. using this link Natal Horoscope this service can be availed.