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How much laxity does your physical therapist or MD suspect that you have and with which direction(s) ie. anterior, posterior, inferior? I am assuming at least a grade II or III as you mentioned that you are able to sublux your shoulder partially and are able to reduce it back in place. With your instability, besides having a strength deficit, are you also experiencing pain when utilizing your shoulder? Ongoing shoulder pain despite participation in a rehab program would warrant further medical intervention(s).
There are many factors at your shoulder joint which help contribute to its stability. They include the concave shape of the socket (glenoid fossa), muscular strength and compressive forces of the rotator cuff muscles & scapular stabilizers, the amount of restraint of the ligaments at the shoulder capsule and the thickness & integrity of the glenoid labrum. With participation in physical therapy and performing strengthening/stabililzation exercises, proprioceptive/somatosensory training & postural/functional training, it is possible to achieve min/none functional limitations for the patient with a grade I or II deficit. As far as shoulder instability tests, they should be performed slowly by the therapist, and I would assume given what you have described, that the testing will more than likely continue to yield positive findings for instability, despite strengthening/stabilization efforts.
As far as your question goes "will my left shoulder ever feel the same as my right shoulder again with proper exercising?", it would be difficult for me to determine without physically examining you. The more laxity and instability you have at your shoulder joint, the more likely surgical intervention may be required in order to help you achieve maximal functional outcomes. It would probably be best to ask this question to your therapist or orthopaedic MD who have physically examined you and will know your condition and will be familiar with your situation. Best of luck to you.
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