I recently purchased a place with several acres of fescue pasture that is thin and needs rennovation (in N. Georgia). This is rolling land with thin topsoil, some rocks and some embedded boulders. I need to rennovate and re-seed the pasture by lightly breaking up the surface without going too deep and stirring up all the rocks or loosing the topsoil to a heavy rain, or ripping out the existing grass. I have a 30 HP tractor w/3 pt hitch and a 27 HP zero turn mower to pull attachments. I need to hear from folks with advice on what type of implements would be best to prepare the soil for seeding. Have considered: core aerator, spiked drag harrow, disc harrow, and chisel tooth harrow, etc., but would like to hear from those who have experience and advice. Thanks in advance.