Troubadour

I am having a Helluva time trying to beat the Gang War mission. Everytime i call my SWAT and unload them by time i get the handcuff option they are being killed before they can even fire their own guns. I have watched a walk though on youtube and tried what he did but he didn't work and i have also gathered all my troops and paused the game and gave the SWAT and a few regular cops handcufs and i assigned all of them a gang member and i equpied the other cops mace to help subude the gang member. It will work with some but not other the best results i got was 3 arrest before all the SWAT guys were shot. Can anybody else provide any other advice? This is the walkthough i watched