A heating pad to get the temps up to around 95degrees would really help the breeding a lot. Do not use a regular light as roaches don't like to come out in the light and thus will be less active overall and breed less. Remove the water dish with the sponge. This is a bacterial breeding ground and could cause a colony wipe fairly easily. If you are feeding fresh veggies and fruits daily like you are now, you don't need any additional moisture source.
If you decide to stop feeding the fresh stuff daily, look into the water crystals as a moisture source. They resist bacterial growth very well and are quite convenient. Also, disturb them as little as possible. Opening the lid to replace food daily is fine, but don't go rummaging through the eggcrates looking for babies every day. That will stress them and slow down breeding a lot.
If you decide to stop feeding the fresh stuff daily, look into the water crystals as a moisture source. They resist bacterial growth very well and are quite convenient. Also, disturb them as little as possible. Opening the lid to replace food daily is fine, but don't go rummaging through the eggcrates looking for babies every day. That will stress them and slow down breeding a lot.