@mr-luxcipher: Very good post. Even if apoc becomes stronger. He hasn't shown strength above Hulk or Thor. They could only dent adamantium. So Apoc would have to be many times more powerful then them to destroy it.
A few extra points:
1) When Torch fried his circuits that was an older model of Ultron. That didn't have forcefields. Also Apoc doesn't have heat powers like Torch.
2) When Apocalypse restrained Hulk, Hulk was weakened by being the nexus of two universes. He was not at full strength and he couldn't amp his strength.
3) When Hulk tore off Ultrons arm it was a lifeless shell. It was an unknown version made of unknown material. That Ultron was unable to fight back, use forcefields or defend itself. In fact, a blog was made explaining why the feat was pis. Regardless in this battle Ultron will be fighting back.