I respect your willingness to break from the cookie cutter builds and try things differently. Its only through pioneering uncharted ways of doing things that we learn to optimize performance. That being said I feel I would be remiss in not saying that this is not the optimal way to AP farm with Veigar. While I recognize what you are doing and why you choose to do things the way you are, I believe you said you had trouble last hitting in the pervious thread. I believe that the Best way to play Veigar is not Q OVER W or W OVER Q. Its a mix based on the team you face. I always get 2 levels of EH an then MAX Q and W First before finishing EH. Simply because as you stated you can by mid game one shot the wolves and wraiths. Early game I believe you shouldn't be taking those creeps away from your Jungler. Maxing Q first gives you excellent cool down and with runes you can hit 2-3 or more for creeps per wave.
That being said what your doing is not wrong, just no the most effective way to play him.
I play Veigar. I suppose I do the R/Q/W/E cookie cutter. Meki->Tear, DFG/Boots...etc. etc. I probably start out slow with the AP, but it shoots up very quick mid-game. I live and die by the DFG as it gives me the great burst I need early on. Dark Matter usually misses until later on. I use it more as a deterrent to scare people back (or be stupid and get pasted with it). It's just not reliable until later on unless you throw extra points in EH, which usually seems unproductive (to me) early on.
I hardly ever play a game where two champs are ever standing close enough to get hit by the same DM. If they are, they're usually tanky players up front. I've always found it better to be able to snipe off one of the range in back during team fights making it a quick advantage for us. This is easy with the DFG/PB/BS. Then I can throw EH/DM around for added control and damage once the other team gets unraveled. Even when ganking early/mid levels, I'd rather use the DFG/PB/BS just to push one of them back if it doesn't kill them. They usually won't be willing to sacrifice themselves to try saving their teammate who is now at a huge disadvantage and will usually die.
You also shouldn't completely ignore the fact of gaining higher AP passive on higher Q from killing champs. It adds up.
If your build works for you and your team is happy with what you're doing, that's really all that matters.
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