I did some playing around with the timings and changing around the details in real games.
--I can say without a doubt that queen first is just hands down better than hatch first.
The money feels the same until about the 8 minute mark, where I just find that I have hundreds of extra minerals. I was stopping too early in my test here. Always follow a 7 pool with a queen immediately.
--Another thing I played with was double extractor trick on 9 vs 8 OV. This one is kinda funky...
The 8 OV actually gets you an extra drone while the double extractor gets you extra money due to that 9th drone. After factoring in the cost of the drone, the double extractor is still ahead by about 80 minerals, that drone does a LOT of mining in his time. Still this CAN be used if you want a bigger rush.
The double extractor trick is limited to 6 lings, there's really no way to get more lings out of it, with an 8 OV you could have 8 or 10. I'm still not sure which version I prefer.
--Finally, I decided to find out how much my hero drone costs me.
I'm keeping him I think, he's won me too many games right then and there. Sending a drone to scout while your lings spawn on a map like steppes of war will cost you another 100 minerals. To me, personally, this is totally worth it, even if my drone does nothing but poke up their ramp and head back home because there's nothing for him to do there, the simple potential that my drone could block that 1 pylon P hasn't put down to finish his wall is enough for me to spend that drone every game.
Overall, I'm going to have to rewrite my Fail Pool BO, but I'm not sure exactly how I want to do it yet... Testing this out was a pretty good task to show me the inefficiencies of my specific choices, and will make my build even stronger.