To focus the discussion a bit:
1) What should I do on Overwatch after Hive to secure 4 gas? The map feels small to me and the bases are kind of far apart.
2) There were things I could have done better before Hive that would have put me in a better position. I welcome that feedback too. Perhaps that's the real place to improve.
3) I realize that I let him get a 4th way too quickly. Keeping a few lings there might have helped, but I did not have map control until ultras, so I'm not sure what I could have done.