Few questions about end correction and port width

[Justinh722 10+ year member]

I'm fairly new to box building. I have yet to build a slot port design that bends. I understand what end correction is. My question is for center port designs. I'm using torres calculator and with a box depth of 24 inches, it says my port doesn't bend when I make it 21 inches long. With a physical port length of 20.25 factoring in the wood thickness, that leaves me only 1.5 inches from the rear of each port to the back of the box. I thought for a dual port center design, I need to bend the ports at a 2 inch width if my port is 4 inches wide. End correction on a center design box would be an inch in my case I assume?

Here is a screenshot of my design. I know I'm a little low on port area per sq foot, but I have some space concerns and I haven't had any issues with the other boxes I have built with around the same port area. If anyone has some insight, I really appreciate it. Thanks

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