Cradler I missed your question before.
What do you mean about locking your shoulders out, though?
What I mean is simply keeping the shoulders tight and back...so that the traps and rhomboids are contracted and the scapula are somewhat retracted. Basically not letting the weight pull you shoulders out of the socket
. If you do a pullup at the bottom you can easily tell the difference between tight and soft shoulders.
Another thing is that you have to absorb the weight as it drops. You let the hips come back and the torso forward. The idea is that the shoulders are not bearing the whole brunt of it and you are decelerating the bar not just letting it stop.
I take it you've gotten used to pc's but what I suggest is trying hang cleans for a while. What this will allow you to do is when dropping the weight you basically immediately go into position for the next rep so that you are decelerating it like I said and then dipping the bar down for the next explosion. This way you're not putting the bar down in between and you can just concentrate on that aspect of it.
Then later you can apply that to power cleans but you would just continue the weight to the floor. Hang cleans are good in their own right.
I've seen men and women alike training this way so you can certainly do it. It's only during the maximal stuff that you would need to drop the bar and even then it can be a controlled drop. But you're going to have this problem whether at home or in commercial gyms, lol, since they don't usually allow you to throw iron around and most don't have bumper plates or anything like that. Modern gyms are to fluffy.