Jwfabrie,
Good news - sounds like you're on track.
You might want to experiment further with the damping. I would have figured your AT-150MLX to be on the "low" end of compliance.
According to the P3 manual (p15, bottom right), in general, low compliance carts should be set at 3-5 using the straight armpipe, and 2-4 using the S-armpipe. High-compliance carts should be set at 2-4 on the straight armpipe and 1-3 on the S-armpipe.
Good news - sounds like you're on track.
You might want to experiment further with the damping. I would have figured your AT-150MLX to be on the "low" end of compliance.
According to the P3 manual (p15, bottom right), in general, low compliance carts should be set at 3-5 using the straight armpipe, and 2-4 using the S-armpipe. High-compliance carts should be set at 2-4 on the straight armpipe and 1-3 on the S-armpipe.