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It sounds like the lifts that are causing you problems (squat, deadlift, overhead press) are also lifts where its common for a guy to really tense up his neck and shoulders during the lift. I've heard of folks (especially someone with giant traps and no neck, sound familiar?) being able to occlude bloodflow to the brain by tensing the neck and shoulders...I think Pappy Boyington did this during dogfights to keep the blood in his brainpan during high-G turns in WWII. You're breathing fine, but perhaps you're inadvertently closing off vessels in your neck for too long due to the higher # of reps per set than you're used to doing?
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