Tom, Do you have the tang with the "Civil War mini-ball" on your stand? You know, the one that works so hard to ruin the sole of your boot?
My '81 came with this terrible design and I soon replaced it with an eBay-sourced stand for a later model R65. IIRC, BMW Motorrad redesigned the geometry of the earlier stands and added a proper foot pad to later models. Best $35.00 bucks I spent and the bike is happier too. My '83 R65 came with the newer design stand and that was the motivation to make the swap.
And as Barry mentioned, if your bike passes well over-center, the stops on the stand and/or chassis may need some weld and grinding or the curved, ground contact points may be worn near flat.