On paper, I don't disagree with your analysis.
But people don't lift heavy things on paper. In a real-world scenario, there are many variables that come into play. And the heavier the weight, smaller the margin for error.
And the OP specifically wanted advice regarding going heavy.
I stand by my original advice that this is NOT the time for the OP to attempt to lift close to his maximal effort.
BHOLL, even you state that you "don't anticipate your ACL being stressed very much with either the conv or sumo style." This means that you cannot be certain that unforeseen variables won't come into play.
I realize that there are zero guarantees in life. Yet, I will not, in good conscience, jeopardize someone's long term health simply because theoretically it's safe.
I get the sense that you're very well educated from a classroom sense. You're most likely a PT or training to be a PT.
What you state, from a text book perspective is straightforward and clean. The real world is complicated and dirty.
Before you accuse of patronizing you, keep in mind that one of the things I specialize in is the bridge from rehab to what most consider 'normal' training. I'm the guy who takes someone on AFTER he's done with Ortho visits/PT sessions, and, now that he's a little wiser, wants to train again but in an intelligent and precise manner.
From my perspective, clinical/textbook knowledge is important. However, empirical knowledge and gut instinct is VITAL. And this is why I advised the OP to lay off the throttle for now.
Of course, if the OP has already made up his before even posting that he's going to go heavy on the deads, he'll use your advice as a potential validation. There's nothing I can do about that. I told him honestly what I would do if I or anyone I was training were in his place.
If the OP is on the fence, however, and for anyone else in a similar situation, ask yourselves this: Are you willing to bet with your long term health just because theoretically you have a gambler's chance?
Whatever your answer to that question may be, I've met plenty of folks who flipped that coin and lost. They're the ones who sheepishly approach me in a gym when no one is within earshot and ask if anything can be done. Sometimes yes, more often it's a case of making the best of what is essentially a debilitation that could have been avoided.
Those barbells and plates will always be there. A safe detour now won't hurt you in the long run.