why didn't DHCP snopping work for you it should have once it was setup correctly for each vlan and the trusting states were set at interface level , that's the feature its to prevent rogue dhcps requests
trust the port where you dhcp server connects and trust all the uplinks between each switch's that are valid and globally enable it
Ip dhcp snooping Ip dhcp snooping vlan 1,2,3,4
Int g0/0/0 Description MS DHCP server Ip dhcp snooping trust
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