[Jiggles]

I have some torn cartilage in my left wrist and I notice that when I am resting too heavily on the bars that it begins to hurt more. Your carpal tunnel issue may be similar. To reset my posture I'll take my opposing hand off the handlebars which forces me to stop leaning on the bars and I feel the weight relieve. Remembering to keep your weight off the bars while riding is key, it will likely relieve some of the tension reducing your pain at stop lights.

Personally I kick it into neutral and lane split to the front. From there I can keep an eye on all the lights and shift into first when I need to. On my beamer the clutch is crazy stiff so this has become a necessity.

Best of luck!