TT uses True SLR for the Icon which I read was an alternate to Kuch.    It is not necessarily 10-1 and, in this case, does not match up with the qpf map if it were 10-1.  Here is the Icon 10-1 on Pivotal.  Much higher than TT with the point being gross differences between model sites snow maps is always a cause for confusion.  WB is almost always higher than the rest for true snow situations.