Olympic lifters are not concerned with hypertrophy but with developing power and strength.
Given a choice of of a stressor for adaptation it will always be with the exercise doing the most work. Simple physics 101 says distance and the load used equals the work. Cutting the range equals less work. Like I said partials have a role in training. It just shouldn't be the primary role. Doing a full range of motion within reason decreases the likelihood of injury because you're training the joint to be flexible.
Concerning the stars of steroid bodybuilding I had a training partner that said I should never listen to a steroid bodybuilder's advice on anything. True, with out the drugs how do they look?
Without drugs how does anyone who is not Steve Reeves or who has genetic gifts look?
You follow the routine of Dorian Yates/Mentzer, both hugely drug fueled bodybuilders.
Why would you think techniques promoted by heavy drug using bodybuilders would work for you, a natty?
There is an inconsistency with what you do and your post above.
What seems logical is not always fact.
So much of what we think is based on bro-science.
See above video I linked about partial range of motion. It apparently works and has worked for many over the years.
There are some Oly lifters with fine physiques. Powerlifters who do full range of motion and have lousy physiques.
For nattys the way your physique looks is usually a result of genetics.