Hi Toco,
welcome aboard the Warmaster Revolution.
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The beauty of Warmaster is that there is no 'right' way to do things.
Even after years of playing...you can still fiddle about with your brigade deployment to find the 'ideal'.
If you find one... let me know!
There is an alternative way to use cheap missile-armed infantry.
You could forget about shooting. [Shock...Horror]
I tend to put skinks (in my Lizardmen army) and goblins (in my orc army) in the rear rank, behind solid line troops.
They offer +3 to close combat results. If you think about how many dice you need to roll against something like knights to get +3 to your result. You'd need to roll on average 12dice!
Skinks and Goblins are nice to throw in front of artillery too. (Although we don't put that on their recruiting posters!) The artillery must shoot the closest target... even if that is a single stand of goblins, limping forward at 10cm per turn, ordered by a goblin Shaman.
Enjoy your games.