Hey Trip,
You have a 28 shell so no these liners will not work for you, sorry.
Per the info in this post, M28 = 309mm. Ignore the size stamped on the upper part of the boot.
The shell of the boot fits sizes in range from *.0 - *.9 (for ex, a 26.0 - 26.9). The next shell takes over where this one ends. The liner makes up the difference from here ONLY IF IT IS NOT A THERMOFLEX LINER!!!! If it is a thermoflex liner, it runs the same as the shell and should be sized appropriately.
Thermoflex liners do not come in half sizes, as the whole size will form to your foot as long as you do the shell test and the shell is the right size.