What is Reddit's opinion of AFA Tooling - Deburring Tool Works on Metal, Resin, PVC, and 3D Printed Plastic Edges - Great for Copper and PVC Pipes, 3D Printing, Resin Art, and Metal Work?

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You can but if the resin level is above the top edge of the mold it makes it more likely that some resin will spill as you move them into the pressure pot. In my experience the pressure pot doesn't actually affect the level by a noticeable amount unless you have . Some resins may contract more than others while curing but that's a property of the resin and isn't affected by pressure.

In most cases I find it easier to deal with any potential shrinking after the item is cured instead of trying to prevent it. Most of the time the level is fine and doesn't actually need topping off so I just use a deburring tool (example here) or craft knife to remove the lip and smooth the edges down since those spots can be fairly sharp. In the cases where the level is too low I will do another small pour to top it off before I pull the item out of the mold.

You can drill from the other side and have the burr on the inside, I own a deburring tool for plastic work like this https://www.amazon.com/AFA-Tooling-Deburring-Printed-Printing/dp/B0B7611J5Y it works like this https://www.youtube.com/watch?v=H1k9vxEwHCc I love them they are useful on lots of stuff.

If they're just slightly larger you can open up the holes in your tower. A deburring tool works well for these small amounts.

https://www.amazon.com/AFA-Tooling-Deburring-Printed-Printing/dp/B0B7611J5Y