Just a note, Jack (Hi, by the way!),

Sometimes testing dark purple, especially when you know you probably shouldn't be, means your body's dumping ketones. This can happen when you get enough carbs to switch back over--then the body doesn't WANT to burn ketones anymore because it's a harder process than burning carbs. Particularly quick-burning carbs. Wait a pee or two and test again. (If you're drinking enough water, it shouldn't take long.)

On the other hand, 50g may not be enoughto bump you out, and looking at your weight, most of it probably went to your muscles pretty quickly. If you're bonking, take some extra dextrose (AKA Smarties) a few sets into your workout for an extra boost.

You may need to fiddle with it until you get what your body needs.

Good luck!