How far should a long book drag your quotes?

You make markets in a stock worth $50.00$. Flat, you'd quote $49.96$ / $50.04$. Random flow has left you long $4{,}000$ shares, more than you'd like, and you still believe fair value is exactly $50.00$.

Model your reservation price (the price you're truly indifferent to trading at) as fair value shifted by $k \cdot q$, where $q$ is your signed inventory and k = \0.00001$ per share is a risk coefficient.

Where do you center your quotes now, and what does the shift depend on?