Lessened at low levels, ultimately increased once the recipient gets past 6th level.
As is,
CLW heals 1d8 + 1/level (max 5), ie an average of 5-6 at minimum level and 9-10 at max level
CMW heals 2d8 + 1/level (max 10), ie an average of 12 at minimum level and 19 at max level
CSW heals 3d8 + 1/level (max 15), ie an average of 18-19 at minimum level and 28-29 at max level
CCW heals 4d8 + 1/level (max 20), ie an average of 25 at minimum level and 38 at max level
If the target is 1st level:
The new CLW would heal 1 hp plus Con bonus/4
The new CMW would heal 2 hp plus Con bonus/2
The new CSW would heal 3 hp plus 3(Con bonus/4)
The new CCW would heal 4 hp plus Con bonus
If the target is 6th level:
The new CLW would heal 6 hp plus 3(Con bonus/2)
The new CMW would heal 12 hp plus 3(Con bonus)
The new CSW would heal 18 hp plus 9(Con bonus/2)
The new CCW would heal 24 hp plus 6(Con bonus)
If the target is 12th level:
The new CLW would heal 12 hp plus 3(Con bonus)
The new CMW would heal 24 hp plus 6(Con bonus)
The new CSW would heal 36 hp plus 9(Con bonus)
The new CCW would heal 48 hp plus 12(Con bonus)
-Albert