Band-aid approaches just won't work, the thermal expansion of the clay and glaze must match closely. It is true that crazing will be evident at low-fire with a much smaller difference between clay and glaze expansions than with stoneware. Thus smaller changes have a bigger effect. It is true that firing higher can change a clay body's expansion. However, the above approach will only work if the increased temperature lowers the expansion and if the glaze firing is lower than the bisque.
Low expansion frits, specifically targeted as additions to reduce crazing, are available.
Change to a frit of lower expansion This suggestion goes in the right direction as it proposes to change the expansion. However, few frits are used in stoneware glazes and the few that are there are sources of specific oxides. Simply changing to a frit of different chemistry and lower expansion is likely to mean altered glaze properties. The statement that ' materials with low coefficients of expansion are less likely to cause crazing' is indicative of the need for a change in viewpoint here. Further, materials of low expansion never cause crazing, it is the ones of high expansion that display it.