It specifically states he copied every power he's seen. Everything didn't have to be thrown at us on what was copied by him. We know he copied heat vision, we know he copied strength, energy output, etc... in regards to strength, I see where you are coming from but I'm also trying to figure out why you don't think stacking strength wasn't factored into this. Doesn't matter, I can't see Bill one arm tossing Amazo, including the hero's (even if they were at partial power) like Wondy did. I also can't see him performing anywhere close to the way Wondy did against the hero's and Amazo.
It couldn't even state the origin of his super strength or how it works. You think it's logical to assume he can suddenly stack strength on strength? You and even I were given really no detail of how his powers worked, and considering none of his feats support stacking strength, it seems unlikely. All we know is he copies powers. It wasn't said that he copies strengths.
Here should be the last example needed to explain it:
Say you're sucking on your dawg Tyrell's toes. And you're tickling and massaging his feet at the same time and whatever the hell else you do. Now this act alone gets you to full mast. You maxed out, that's it for you.
Now if your eastern buddy Ping Ling comes out of nowhere and plops his feet next to Tyrell's what is that going to do? 4 feet right in your face. And keep in mind Ping Ling would normally be enough, but compared to Tyrell he might as well be the DC character to Tyrell's Hulk. Ping Ling and his feet are just inadequate in comparison.
So, is Ping going to somehow change your density? Probably not. If anything he's probably going to just make you make a mess.
And that's what this is. Amazo already had Tyrell's feet in Superman's strength. Even if some Ping Ling feet come along that isn't going to put him over. Unless otherwise stated you aren't going to turn from rock solid to diamonds and Amazo's strength isn't going to start stacking stacks on stacks.
Hahahahahahaha...everything except with the feet comments, I agree with. They'll probably go into more detail about Amazo strength later on. We at least know he was elite physically though. That much isn't denial imo. Good post overall.