Maybe a less aggressive depth of cut might help, too. Looks like pretty hard wood. The Carbide3D #201 looks functionally equivalent, for $20 apiece, if you don’t wanna risk another Amana. Might also think about HSS for wood - it does tend to be (or feel) sharper. I paid just over $1 apiece for some 1/4" HSS cutters from “tool-edge” on ebay.
I feel like you could go a lot more aggressive with clamping, too. Getting something over the top of the piece might definitively eliminate that problem (I like some DIY oak clamps of the design that many people use for their first project)