As many of multiple servers are aware, I was in fact the second player to accomplish a quad neo.
So I know my stuff. ;)
Well, kinda...
Not going to give away all my secrets yet, but here's one:
Use speed.
No, not the potion or effect.
I'm talking about momentum.
Step One: Momentum all the way to the jump without stopping.
If this does not work, use this trick for momentum:
Step 1.5: Jump up, don't move until you're in midair. Shake from left to right three times.
Step Two: As soon as you finish shaking, punch the block you want to land on, this will give you a further sense of where you will be going.
Step Three: Back up, shake three times, run, jump.
This trick seems long, but it's effective 99% of the time if performed correctly.