Do the lift with an EMPTY BAR.
You WILL NOT BE ABLE TO MOVE A HEAVIER WEIGHT ANY FASTER THEN AN EMPTY BAR.
If you move an empty bar 'slowly' you will not be able to move a loaded bar any faster mate. Post up some videos. I'll post up some videos of me lifting with an empty bar soon.
Then as you get use to the feeling of SPEED and POWER increase the weigh up gradually.
There was this dude in the gym on Wednesday, PS 40kg SLOWLY, more like half power snatch half wide grip press at the top. I showed him how to move just the bar fast then do 30kg and then do 35kg. He improved a lot but still doesn't have the speed. But then it takes TIME AND PRACTICE to build speed.
It's fast when you don't need to 'think' about it and when it becomes 'automatic'. If you thought about catching a ball thrown to you, you'd fail. It's automatic now so it's very fast.
Hang your not keeping the bar close to you and from the floors your able to keep it closer to you and this is probably why your getting the 'oomph'. Both are effective. I'd go lighter to build speed in pulling under the bar.