Ok well first the Leadshine AM882 are good drives but even those will limit the performance of Large nema 34 motors. I wouldn't go above 8Nm with Nema34 motor using AM882's and would run them no lower than 70vdc. I would also try to find 8 wire motors so can wire Bi-polar parallel. Most nema 34 are 4 wire and wired series which means you'll need more voltage to get speed and torque. Hence why they use drives with Mains voltage.

Also don't take much notice of Speed/torque curves from most motor data sheets you see unless high end brands because they are meaning less in real world.

Regards working with Aluminium then Makita router isn't going to last long or be very good. Wood routers are far too fast for most cutters and don't have enough torque. The higher cutting forces also kill the bearings quickly.