Tuning vertical climb rate

I have set up octo and it seems quite stable and easy to control. I haven't done any tuning.

In the 2 modes I have tested the vertical speed doesn't seem right. In Stabilize if I move the throttle up fill it shoots up like a bullet.

And in loiter mode it barely moves up or down at all. 

How can I tune it so the Stabilise mode is less aggressive and loiter mode is more responsive? I am looking for gentle smooth control for filming.

I have read around and found options such as 

PILOT_VELZ_MAX and PILOT_ACCEL_Z but I haven't tried them yet. I'm not sure how they relate to the specific flight modes.

Thanks for any guidance here.

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