Base of the neck

As an ongoing student, I get the privilege to train using the methods that Sifu Kelley provides. I've been following the teaching on the pearls and core filling. Something that I've encountered is the realization of how much tension I have in my shoulders holding them up against gravity. Also, I've seen how I use the hydraulic pressure of the core to push up my crown from the front. The latter probably contributes to the former. As I let go of this in training, I get a taste of suspending the crown and dropping the shoulders. On the positive side I'm able to feel the stretch from the pallette down across the front of the neck, across the clavicles. Also, I can feel the diamond of the trapezius on the back. On the "negative" side, this stretching has lead to a couple of things: 1. The base of my neck at C7 level feels sore. 2. I've been experiencing some sensations going down my left arm from my rotator muscles and upper trap down my arm and into my hand. It's a very specific thread like line. The sensation varies from a slight burning to tingling in my hand. Am I releasing too much, too soon?