Add -dagrestart 1 and you should be able to use -daglim 4005 to -daglim 4011 depending on the card, which will greatly increase the hashrate. Also, you must use auto-tune (do not specify -gt values) because the optimal -gt value may change with each new epoch, and will definitely be different than before. Finally, the new -rxboost option (just add -rxboost 1) may provide some small additional boost.