Revision of Chin Implant
Yes, your chin augmentation surgery will require a revision as the implant is asymmetric. I would suggest an extended anatomic implant which will provide you with the lateral augmentation you are looking for. The extended anatomic implant provides males with an attractive "square" jawline. I would suggest a silicone implant, such as the Implantech Conform device. Good Luck
Lateral projection chin implants
The answer to your question is yes. There are chin implant that extend along the boarder of the mandible thus making the entire jaw look more wide.
Chin Implant Replacement
It is pretty hard to judge your chin implant results based on these partial pictures but it clearly is asymmetric. The terms you are using suggest that these are Medpor implants rather than silicone. Know that every single chin implant of any material can be modified during surgery to change its shape and dimensions to be customized to any patient's needs. Not that you know what does look good on your face, this information should be helpful in making a new and better selection. I would first start by having some computer imaging done to see what changes would work best with your face.