Striking the Balance: The Ideal Engineering vs. Sales team split in a young B2B Startup?

In the current stage of our B2B startup, we're finding that the complexities and technical demands of our product have warranted a 60:40 split between the engineering and sales team respectively. We're constantly debating if this is the optimal allocation. As we navigate this startup journey, we're curious to know what other teams have experienced. What does your team split look like, and why?