Revision for asymmetry with tubular breasts
If you are happy with the appearance of the left breast then it is usually best to leave it alone. I agree that the right side needs more fullness on the lower part and a larger implant might be required. If you are changing the type of implant - for example, from round gel to shaped such as Allergan style 410 - then both side should be changed so the breasts will not feel different.
Should I replace both implants in tuberous breast implant revision?
asymmetry of the breasts are a challenging operative adventure. In most cases a few operations are needed. In my over the internet opinion I would lower the crease, use fat grafting to even out the breasts, correct N/A sizes...
If having 'perfect' symmetry is important to you
then you will need more volume in your smaller breast. But your tan lines suggest you are comfortable going out in a swimsuit and if so, why spend the extra money and time and accept the additional risks of more surgery? I'm positive your changes from your pre-op appearances have been exceptional and if they have achieved most of your goals, it really comes down to how perfect does it have to me for you.