At this time of year, egg production is more a function of season (tail end of moult) than number of roosters. Egg production should jump up shortly as day lenght increases, especially if temperatures are presently low.
You do not indicate how birds are housed nor your objectives. If eggs for table and birds are well protected fro predators, then no roosters are needed. If eggs to be hatched, then a single rooster to every 6 to 10 hens will do. If birds are to be free ranged and predators such as hawks expected, then fewer hens per rooster will help control some losses to hawks and at least increase your ability to hear when a predator is trying to take a member of flock.
For fun, I set up so mulitple flocks are present, each with a rooster (sometimes two), a roost, and a feeding station. This requires some acreage but can be done and can be quit intertaining when the flocks interact.