I was just thinking, might as well abuse his passive to the max, you know. Atmogs just doesn't seem to provide the bang for the buck (and costs a bomb). Atma's Impaler is the problem - it is a crit item. Blitzcrank doesn't particularly synergize with crit.

Okay another of my gut instincts is this: don't get Maw of Malmortius. Blitzcrank doesn't have heavy AD scaling. Hexdrinker is a situational item. One guide I read before said to build an early Sheen for some damage, which kinda makes sense.

I think you might be right there. I need to crunch some numbers and make the changes accordingly, look for your name in the new helpful players section!

Atmogs... nah. I think you'll be better off with a core of Frozen Heart + Banshee's Veil instead, since you have Manamune.