On the bench with just VFF turned on it should have normal swash response and travel in Stabilize mode so the heli will be flyable..15 on roll sounds right, .03 on pitch doesn't. The swashplate should barely move in the pitch axis with VFF that low. I doubt it would be controllable at that setting with the PID's zero'd.
Then take it out and hover it. It's best to provide some fairly aggressive stick inputs in pitch and roll during the hover test. Then pull the logs and look at the RATE signals. Increase VFF until desired rate (RATE.XDes) from the attitude controller matches actual (RATE.X). The control inputs will be undamped with the PID's zero'd. But we're not looking for flight handling quality here, we're looking to properly set the rate in the software just like you would do with a non-pixhawk heli setting the rate (and usually expo as well) in your transmitter. With the ArduPilot system that is done in the software and no rate settings are made in the transmitter.
VFF is direct stick to swash with no rate damping. On every one I've done, the heli gets VERY snappy and responsive if you set the fastforward so the rate actual vs desired actually match. Again drop the angular Accel values a bit if it gets too snappy and quick. At no time will the heli become uncontrollable or break into oscillation with no damping from the PID loop. It will simply do exactly as you tell it to do with the sticks. The VFF just determines how fast it does it.
Edit to add a note:
This is done in Stabilize flight mode. You still have self-leveling and attitude control with no stick inputs with the PID's zero'd. So when you look at your logs you can see how well the heli is responding to the requests from the autopilot as well as your more aggressive stick inputs. The autopilot uses the VFF too, and actually depends on it for the proper rate.
Ex: if you or the autopilot wants 10 degrees roll left, but it takes 1.5 seconds for it to get there, the rate is too low. And by that time it's probably requested a new attitude. So when you look at the attitude desired vs actual, it's not going to track properly because the heli is not responding fast enough and is flying over-damped on just rate PID's.
I gained a better understanding of how the attitude controller works after Leonard took the time to explain this.
Then you can set your PID loop to damp it so it's smooth.
I didn't catch the fact that SAB head kit came with 465's. That should work good. Three blade rotors eat more power than two-blade at the same speed. But you should be able to slow down a three-blader and have a smoother running heli.