If you're having trouble with the Hole command, you can almost always use another command sequence to duplicate the results.
Place Circles of the preferred diameter snapped to the Points (you can tab into the Diameter entry in the Circle's Inspector Bar, enter the value, then Ctrl-L to lock the value for subsequent use).
Once you have Circles properly positioned, invoke the Quick Pull command and hover the cursor over the Circles until a red cross-hatch appears. You can then click and adjust the depth to -8.
Alternatively, you could create a Cylinder of the required diameter and twice the depth (so you don't have to play games with the Reference Point), and use the Rubber Stamp mode (right-click when the cursor is over the main drawing area and select it from a list) to place duplicates at each Point. You can then 3D Subtract each Cylinder from the extruded piece. You could also 3D Add all the Cylinders together and only have one subtraction operation.
TC Pro Platinum 2019, 2018, 2017, 2016 & 2015 (all with LightWorks & RedSDK) & V21
System: i7-5820K @ 3.30GHz, ASRock X99 Extreme4, 16GB DDR4-2133 RAM, Gigabyte GTX 970, Samsung NVMe SSD 950 (256GB), Windows 7 Pro (64-bit) SP1