I'm a greenkeeper by trade myself, at a golf course rather than bowling green, but we never had them set with no contact. They were backlapped with a paste when necessary, and always cut well. Maybe it's different for a golf course than a bowling green, maybe my old boss who taught me was old fashioned, he had been in the biz for about 50 years, I don't know. I'm pretty sure at TAFE they taught us as he did, but I will dig out the old books and check it out. It actually recommends light contact on the Toro commercial website as well. Everywhere I look it's saying light contact, I think we'll just agree to disagree. The way I was taught works for me in my situation, and that's the main thing.