To have the most control you’ll need to setup the support depths for these or use different FBXs to get the most destruction by knocking off chunks. The Multiple FBX tutorial from Nvidia can show you this concept in action.
If you want to control the speed more directly, because with the projectile there is a impulse being applied through its blueprint when the object is hit, you can open the settings for the destructible and change the Max Chunk Speed. This will allow you to set how fast your object will fall, so anything over 0 will be the new fall speed.
It may take some tweaking but there are a lot of settings in these parameters that working through and testing different ones for what they do will give you a better understanding. Hovering over the label for each will also explain their function to give you a better idea of what it controls.