Slight variations in the positioning of the wings of a chin implant are more common than one would imagine. To feel one wing under the gum and not the other is probably a normal situation. Time and decrease of swelling will probably cure most of your perceived problem...
After liposuction alone you can get this type of lip movement asymmetry. Many times it may not be due to a nerve injury but an injury of the muscle. There are multiple muscles that help to pull the lower lip down. Both types of injury are self healing and would be expected to have a complete...
Implant size and numbness are two different questions. At this point given that you have had two operations in a relatively short period of time I would wait several months (at least 2-3) before doing anything with the implant unless you can definitively tell that the implant is resting on the...