My khan advices to limit the unitlevels to a 3-4 levels max like

inferior
ordinairy
superior

or

civilian
militia
veteran
elite

or whatever. and dont show this level to the enemy.

although ur not allowed to buy inferior knights ofcourse.

just 4 levels will suffice. it would limit the clicking when buying the units. and ur smart enuf to see more advantages.

0-9 honourlevels we have knownjust doesnt add really something to the game