Pat:
Ah, now I understand your question. It is likely my "newbie" status on this discussion board that caused your confusion. My initial post above had nothing at all to do with Greg's initial post; I simply searched for an historical post on XGD and piggybacked onto that thread. My post was asking a question about XGD but it had nothing to do with Greg's initial post.
My bad.
That said, I would agree with you that speeds approaching 12 would be, in my opinion, unsustainable over long stretches of time given the humidity and rainfall that we experience in Northeastern Ohio. We typically shoot for a consistent 10 - 10.5 feet but obviously weather is a big factor for us.
My question was centered mostly around what we should do at our club immediately after the installation of XGD regarding aerification. I wasn't sure that it made a ton of sense to do a deep tine aerification a week or two after completion of the XGD installation given the stress that I assume the installation will put on the greens but I obviously know virtually nothing about the process other than with I've read online.
Thanks.