@kennycro@@aol.com, thank you for that detailed reply, and I also want to say that it's great to see you here.
I want to explore some of what you said - I don't disagree outright with anything but I think bringing the StrongFirst approach to things makes a difference, and I'll explain below.
Performing perfect reps with 30-60% of your 1RM improve your technique with your 30-60% 1RM. It has a little but not much carry over to your technique heavy loads (85% plus of 1RM).
This may be true for lots of people but we do our best to make it _not_ true at StrongFirst. One of the things we talk a lot about is the idea of having a 'volume control' on each effort, and matching the volume control setting to the weight you're moving. The idea of the volume control is that you don't use different technique for a light weight than you would for a heavy one, you just dial back the intensity.
It's easy enough to read what I just wrote and say, "yeah, that sounds nice, but it doesn't work that way." I think part of what we try to teach here is making it 'work that way' as much as possible. How many people achieve some/most/all of that? I couldn't tell you, but it is something we're big on around. We don't want the muscle firing sequence to be different with lighter loads.
One point I made recently in another post here was that there is a "right" weight to use to learn a new skill for each person - too light and, to use your terminology, the firing sequence would be different. That's why I encourage everyone to go heavy enough in weight to make yourself respond in the same way as you would with something truly heavy. And as I mentioned in that other thread, as one's skill improves, one starts to be able to demonstrate good form with lighter weights as well as with heavier.
@Emanuel, you mention doing 5 x 5 with 225. I assume you mean pounds - if you mean kilos, ignore what's to follow.
For most healthy adult males with experience deadlifting, 225 isn't heavy enough as a working weight. I know a 62-year-old who lifts raw in the 148 class and he does 5-10 singles at around 285 lbs., 4-5 days a week. That's fewer deadlifts in a week than you're doing in a day. Unless you've got particular reason to do so, I'd rather see you achieve volume in your training program by some other means and change your deadlifts to be heavier in weight and much lower in volume.
And not that there aren't reasons, but we don't know anything about you. If you want good guidance, we need an exercise history, and injury history, all the activities you're currently doing besides weight lifting, where weight lifting fits in your priorities list, and how you see the deadlift helping you. Armed with that, we might be able to talk about specific programs and approaches you could try, but without that, it's a lot of theory without practical application.
-S-