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[voigts]

It looks like you did mount the new blade backwards. It doesn't mount according to which side the print is on. The cutting blades should be putting force downward onto the cutting edge. This is to keep the piece being cut from being kicked upwards by the blade. You mounted the blade so that it is cutting upwards on the alu and hence the ripping effect. It shouldn't do that if mounted correctly.

Exactly what router bit are you using to make those cuts?

I've never used unibits. Are they better than conventional bits?