I've been stuck on overgrip Korean dips for months now. I should note that I cannot do one actual korean dip, rather I've been spinning my wheels performing these with a backstop for the feet. Essentially, I picked up this method of progression from the forum here where one simply places a backstop behind the bar that one's feet meet upon descent. As strength increases, the backstop is moved further and further back until you are actually not hitting it upon descent and are performing full Korean dips.
Sounded like a solid strategy, but for me, this is the one exercise where I am lacking any consistency whatsoever. One week I'll be performing 4x3 reps without any issue and then the next week, where I should be performing 5x3 at the same backstop-depth, I might not be able to perform one single set of 3 reps. I've read through the few korean dip-posts I could find and have been trying to implement the points of emphasis recommended, but I'm not sure they're helping or perhaps I should be working this exercise in a completely different manner.
Currently, my focus with each rep is:
-head up, looking at where ceiling meets the wall
-resist arching of the back
-upon descent, retract scapula intensely and attempt to keep elbows "back"
-during descent, working to keep forearms "stacked" over wrists
-upon ascent, attempt to push hips forward while arcing back with head and shoulders pulled back
-drive the rep hard on the positive, ascent portion of the rep
I've got all of this going on in my head and half the time I end up all the way at the top, but just don't have enough to pull myself back to starting position and instead end up just falling forward off of the bar.
Any suggestions on what I should be doing differently? And "not thinking so much" has also been attempted - I've tried just clearing my head and jumping right into the reps. No luck there either.
This exercise is literally driving me insane.