A few points for you to consider...
a starting load ought at least to cycle the firearm, oughtn't it?
you would think so, and I'm sure it did cycle THEIR TEST GUN!
Whether or not it cycles YOUR gun is a matter of chance. Every gun is a little different and even individuals of the same make, model & caliber can show differences in what it takes to run them reliably, and what their max pressures are.
Reloading data is a guideline. It shows what they tested, and what they got. Most guns fall into general groups, so what they got with what they used is PROBABLY CLOSE to what you will get. BUT it's not the same, cannot be identical, because you are not using the exact same things they are.
The big one is you are using YOUR gun, not theirs. And even if you are using as close as you can get to their components, its not precisely identical. And, then there are variations in how the ammo is actually loaded.
I've run low end loads that failed to cycle a 1911A1, and did cycle a Sig P220. Each gun is an individual, with a LOT of factors involved.
A word about your grip, how you grip the pistol does make a difference in how well it runs. And the "thumbs forward" grip, in the posted pic is only ONE way to shoot. It may be what all the top competitors are using these days, but they aren't shooting YOUR gun, or using your hands.
It's a good grip style for some things, and a horrible one for others.
There is a "trick" to using the "old style" (twist knob) speedloaders, and its a simple one. Learn to master the "loader" part first, THEN work on the "speed".