Not possible to put measures on x-axis directly, true, but there is a workaround.
Create a stand alone table, that is a table without any relationships. Say your 16 measures are named measure1, measure2,...,measure16.
The stand alone table, let's call it tabMeasures, should have one column, let's call the column Measures. The values in this column should be text strings. For simplicity you can use the same names as your 16 measures, but it is not strictly necessary:
The values on the rows could/should corresponds to your measures, in your case you should have 16 rows. Add a measure to this table like this
xAxisMeasure =
SWITCH (
TRUE ();
SELECTEDVALUE ( Table[measureName] ) = "measure1"; [measure1];
SELECTEDVALUE ( Table[measureName] ) = "measure2"; [measure2];
.
.
.
SELECTEDVALUE ( Table[measureName] ) = "measure16"; [measure16];
BLANK ()
)Now add the column of the new table to the x-axis, and add this measure as the measure
