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Oh the old style. Take off the spring and small nut, That tends to be everyone issue. If you don’t have them in there you do not have the coupler seated all the way. You are also using a larger spindle than most of us so you will need to turn your acceleration down on your z axis in the firmware, try 30.
How to adjust your drivers from the instructions page, http://www.vicious1.com/assembly/ramps-wiring/
If you are using the drv8825 you want to set them no higher than .7v unless you have a fan on them, and set the voltage at 90% of half the steppers rated amps. If you are using all my stuff .7 on all of them is good.