Does anyone have any experience with the core aerator that mounts on the front of a ZTR mower? Specifically the one manufactured by CMI (http://www.countrymfgstore.com/zetumocoaewi.html) or the Southco (http://www.southcosalesinc.com/Attachments08.pdf). Our area has been in drought conditions for 2 years and the soil is rocky anyway. We have used the Turfo, Lesco, Bluebird, and Ryan walk behind aerators but they don't have enough downforce in our dry conditions. Any input would be greatly appreciated.