Hmm, interesting stuff here. I'm not dropping the bar, I lower right down, because I have a cheap-ass bar. I'm also not releasing my grip between reps or resetting. I'm doing 531 and usually hitting anywhere from 8-13 reps on my AMRAP sets. I feel like my form is fine, and I feel like it's my grip that fails first, preventing me from busting out a few more reps. Throughout the week, though, my DL AMRAP's are my favourite sets, they leave me shaking.
Other than just taking time to get set-up and tight at the beginning of each rep, taking a few seconds between reps makes each rep more like the first. And since the goal is usually to improve the one rep max, training each rep closer to those conditions is generally considered beneficial. That's not to say that you always do rep in such a way, but that doing some different would be like doing a deadlift variation.
i dont lean down to put the bar at rest, but i dont drop from a full pull either. i go back down about halfway, controlled, and then release it and reset.
i found that when i leaned all the way down to sit the bar back down my form was shitty on the following pull.
If you choose not to crossfit-out and actually lower the bar to the floor, the bar path should be nearly identical to the way it came up, only in reverse. If putting the bar down is throwing your form off, you may actually need to work on lowering it correctly. Initiate lowering it by sticking your butt back, keep your hips high until that thing gets past your knees, then bend your knees til it touches down.
I don't want to derail this thread, but I have many questions about the continuum between 'good' form and 'bad' form. Maybe I'll collect my thoughts and start a new thread.