Army composition question

[BobMaster]

Hey all I'm back :p

I recently started KB again and I need some advice ...

My current army consists of:

Archmages
Knights
Evil Beholders
Horsemen
Inquisitors

Now I see people trashing groups of match and even slightly stronger at lvl 11 (my lvl now), but I have a hard time killing match groups with my army unless they are all slow units.
Only useful spells I am missing are Resurrect and Target, none of my magic is higher then level 1 yet because of rune costs, I do have Higher Magic lvl 2.

Any advice ?

P.S.: I just killed Lucky James with minimal losses, on my way to the mines.