Hmm, you can be right.
I'm not used to play with high elo. I actually don't like ranked games since people act way too rude in my oppinion. So usually i stick to normal games, where the usage of hourglass works perfectly.

And i want the extra AP for some bonus damage output late game, because when i won't do that, i will just be ignored late-game. In my oppinion you want some decent dmg output as tank so people will have to attack you..

I can't disagree on what you said, Since I don't know how high elo games work...

But what would you suggest?

I don't know what you plan on doing with a Zhonya's Hourglass, seeing how Gragas is moreso a tank than a caster, you don't want to phase shift out of damage as a tank so the rest of your team can die, right? This build is also way too squishy during early-mid game, where you will be nuked down like a boss even with your 18% damage reduction.

Your situation of them doing nothing after Zhonya's is character of low ELO play, high ELO have very fast reflexes and switch targets upon hearing Zhonya's and won't target you to start with - they'll just CC your *** to start and move onto your carry.

This isn't a guide for high ELO but I won't downvote it because you did put some effort into it and I don't know how well it works in low ELO. Try to incorporate some of the things I said.

Thanks about the marks, must have clicked one time too much.

Well... ok you are right about his passive, though heal may save the day in team fights.. I like it anyway, but that's just me.

Thnx for feedback!

You don't need Heal. Your passive gives you a lot of survivability and staying power in the lane anyway. I would recommend Ghost, Flash, or Exhaust in its place. You also have 10 marks, which isn't possible. Finally, I'd recommend getting Shurelya's a bit later since it's not really that good until late-game team fights, and that way, you can have Philosopher's Stone earn you a little more money.