Alright, IMHO, you don't have a product market fit. For a B2B product, you need at least 10 paying customers before you can declare some sort of product market fit.
You won't have a "real" product market fit until you have 20 "solid" customers. "Solid" customers are less likely to churn and use your product on a regular basis. It always takes longer for the deals to close and the money to hit about bank accounts. Of course this depends on your deal size too.
As far as equity is concerned if you want a co founding CTO you need to part with at least 20%. The CTO should feel invested enough. With low equity, he/she is more likely to leave you on first signs of trouble or slow down.