I believe the previews when you click on the kit pieces are full velocity, so you're getting the fullest, loudest tone. When you manually pencil in a MIDI note it's a set value, I think 80 by default, but I forget. That's probably the difference you're hearing. If you want the full crack of the drums, turn up the velocities in your MIDI notes in the editor.
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Mac Pro 5,1 2.4GHz 8-Core 16GB RAM High Sierra | Focusrite Scarlett 6i6 Mk2 | Pro Tools 2020 | Studio One 4
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