It won't let me post in the group thing for some reason, so I'll send you this here.
About Hydra:
I suggest either replace Hydra's ult with something less passive, more player skill rewarding, or have Hydra lose the bonus stats upon death. I don't think the rate of gain is the problem.
The problem before was the catch 22. If you don't kill him, he became stacked without the need of farming strong items, but if you kill him enough to deny him gold for good items, he became stacked anyway.
Now, the problem is... he becomes stacked, passively, nothing you can do about it. Simply lowering the amount he gains is not going to work. Either it will make the stat gain irrelevant or it will still be enough to make him carry.
What I'm saying is, he's just so foolproof that he's imbalanced in comparison to other late game heroes. Normally, carry heroes must be well farmed and played carefully if they are to carry to late game, to reach their potential. This is the main balancing factor of late game heroes. They can be countered by putting the pressure on them before they become strong. Sorry if I'm stating the obvious, but Hyrda's current ult disreguards this balance. He will always become strong late game even if he can't farm items.
So anyway, my suggestion for Hydra is either make him lose the bonus stats on death or make a new ult for him.