Here’s your maximum of 10% in the Confederate tariff rates.
ACT TO PROVIDE REVENUE FROM COMMODITIES IMPORTED FROM FOREIGN COUNTRIES.
SECTION 1.
The Congress of the Confederate States of America do enact, That from and after the 31st day of August next, a duty shall be imposed on all goods, products, wares and merchandize imported from abroad into the Confederate States of America, as follows:On all articles enumerated in Schedule A, an ad valorem duty of twenty-five per centum. On all articles enumerated in Schedule B, an ad valorem duty of twenty per centum. On all articles enumerated in Schedule C, an ad valorem duty of fifteen per centum. On all articles enumerated in Schedule D, an ad valorem duty of ten per centum. On all articles enumerated in Schedule E, an ad valorem duty of five per centum. And that all articles enumerated in Schedule F, a Specific Duty as therein named. And that all articles enumerated in Schedule G, shall be exempt from duty: to wit:
Your can read the whole thing here.

According to you, a 25% rate is far above what is necessary for revenue. So we’re the confederats protecting domestic industries. And was the war really about Tariff rates when the vast majority of the South’s population never paid a penny in tariffs.
Once they were at war, they imposed tariffs, seized property and did everything else imaginable to try to survive - as any government would under those circumstances. That is not what they set out in the Confederate Constitution when they thought they would be allowed to live in peace.
You keep trying to compare *WAR* to *PEACE*.
Without War, the North was screwed. War was the only thing that could stop the South from implementing a future that benefitted it, and cut off the money to the North.
Yes, people tax a lot higher when they have to fund a war.