Late at night, it may not be a carry down issue, but rather an issue of all the oil being gone. If the head oil is out the window, the Doom or anything stronger may just be burning up. Here is my new suggestion: get in a league, and don't worry so much about what your ball does during practice. You will find the Doom a great ball for league conditions. I've also learned that when it comes to practice, don't worry so much about your ball reaction. You never know what you're going to get in practice, unless you're sure that the lanes are freshly stripped and oiled. As far as practice times, that's a rarity. Late at night it's most likely not so much about carrydown as burnt heads and spotty conditions. During your practice time, focus on executing a good shot, and don't worry what the ball does. Also, take any money you may have considered spending on new equipment and spend it on coaching, instead.
One more little tale. Here is what happens when you focus on equipment early on. You never really know if you are doing anything right, or you're just getting movement because you just bought a "hook in a box" like the Action. Honestly, seriously, I can't stress this enough...it doesn't matter. If anything, buying a new ball could just be disguising problems. If you think you're having trouble with carry down, try a more direct line to the pocket. There is NOTHING wrong with a relatively straight strike ball. Heck, you can take this opportunity to learn to play ANY line with your one ball, and in a couple years time you can then worry about whether you could use a particle pearl or a solid reactive with a lower RG.