“did a quick look: I see in the confederate succession of Georgia they talked about the act of 1846 which lead to the Morrill Tariff.”
The Ordinances of Succession:
South Carolina: References slavery six times; taxes once, and tariffs none.
Mississippi: References slavery three times; taxes or tariffs, none.
Florida: No references to slavery, taxes, or tariffs.
Alabama: References slavery once; taxes or tariffs, none.
Georgia: References slavery 35 times; taxes or tariffs, none.
Louisiana: No references to slavery, taxes, or tariffs.
Texas: References slavery 22 times; taxes or tariffs, none; one references to the seizure of private property.
Virginia: References slavery once; taxes or tariffs, none.
Arkansas: No references to slavery, taxes, or tariffs.
North Carolina: No references to slavery, taxes, or tariffs.
Tennessee: No references to slavery, taxes, or tariffs.
Missouri: No references to slavery, taxes, or tariffs; one reference to the seizure of private property.
Kentucky: No references to slavery, taxes, or tariffs; two references to the seizure of private property.
In summary, out of the thirteen Ordinances of Succession, slavery is referenced 68 times; taxes once; and tariffs none.
I only looked at Georgia and it did reference tariffs (act of 1846)
The American Warehousing Act (act of 1846) remained in place until 1861 when the original version of the Morrill Tariff attempted to repeal it.
You are confusing the Ordinances of Secession with the Declarations of the Causes of Secession. Only three or four southern states issued those, giving their reasons cor taking the actions they took. And in all of those slavery is by far the single most prominently mentioned reason.