Thanks H20fwler. I looked at the tree again today and sketched out what I think the fix will look like after the snow melts, allowing me to actually implement the fix. The brace will go right at the weight balance point of the crown, so I don't think I'll need to cut any of it back after all. There's another 8-11" of snow forecast tonight, so it is going to be awhile before I can brace my standards.
By the way, in case anybody else has this problem on sand, I thought I'd mention that I planted trees on M111 right next to these, and none of those have leaned.
By the way, in case anybody else has this problem on sand, I thought I'd mention that I planted trees on M111 right next to these, and none of those have leaned.