In our group we could see that the 5-point rounding causes weird things in the skirmish / firefight versions.
One example is the “savage orc” which has the same point hit as a “cave archer” for a difference of 6 in shooting range and an attack in charge. There are also equipment options which at 5 points are very expensive for one figurine.
Have you ever considered no longer rounding the points to a slice of 5 but to the unit?
There is also the method that the 9th age used by doubling all the costs to provide a little more “mark” the difference.