Personally i would say drop Saruman, add a Captain, ally between Raiders and Legion and put in the Scouts to get some more bow support. Finally drop the Berzerkers for some Ferals or even put both in the same force, backing them up with pikes and using the right one or two handed attacks when needed (obviously if you plan to use them two handed send the pikes elsewhere).
At the end of the day you can have a fair size force for Uruks, just don't waste points on Saruman and siege kit and fill out troops, cheap Captains (or Lurtz / Ugluk / Vrasku), stock up on ranged weapons (push that bow limit to full 33% if you can) and get in a few elites like Ferals or Wargs.
Or just play for fun, have a laugh and field what you want so long as it is legal by LoME and you enjoy it as a force, like mine
'FireKnife'