Orcs & Unit Size

Okay so I love my orcs and goblins, but I have really struggled with the use of large orc units on the field. And when I say large I am talking 40+ model units. Getting these guys around the field, the fact that psychology can make these seemingly unstoppable unites break and hall ass toward you board edge. I love the large units, they seem to really really make sense on the battlefield, but the fact that a single bad moral check and just simple maneuvering becomes a huge hassel. The larger the unit the bigger its flank, the easier it is for a flying monster to negate the ranks, but without the big units it seems like orces lack the power necessary to force their way thru the harder units in a lot of the top tier armies.