I'm sorry I don't have any personal experience with the cartridge, bullets or powder you are using. But I do have a large amount of experience reloading in general, which may help explain why you are getting what you got, and conflicting load data.
it is because every gun and ammo/component combination can be different.
Most times things fall in the middle of the bell curve, but "stacking tolerances" can result in your gun and ammo combination being at either end of the curve, and there is NO way to know until you shoot them.
Barrels are faster or slower, depending on a number of factors. How YOUR gun handles pressure depends on a number of factors. The same load (and within SAAMI limits) can produce widely different results in different guns.
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I had a bad experience last year with some load data from the Hogdon site, their starter load was pretty hot and at .5 gns above the starter load I blew a primer.
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This is an example of what I am talking about. I'm sure Hodgon didn't blow a primer in their test gun with the load that blew a primer in Houndawg's gun. Every gun and component combination can be different, how much different can range from undetectable to drastic, even dangerous. And there's no way to know, beforehand.
Also, you need to be aware that all max loads listed are not always max due to high pressure. Sometimes, the "max" listed is just where the testers stopped, for some other reason.
Everyone else's data are guidelines, valuable, useful, but guidelines, the real rules are what your gun shows you works and what doesn't.