Pearl millet will not usually come up good in an unprepared no till situation unless the field is burned down w/ roundup and the soil agravated w/ a aerator of some sort first, getting pearl to germinate quick and consistently is key to a productive stand,so I always disc and level up the field so good seed placement at a consistent depth w/ good soil coverage is achieved. Pearl seed is high$ so taking time to prep is advised. Sounds like red river crabgrass will serve you best for overseeding