I'm not entirely sure what this would be called, so I'll go with the above. I also need to note that I'm not actively looking to mess with this, but I'd like something I can read back on later.
Essentially, I'm looking for a sort of guide that helps with choosing the "best" case for slotting on a per power basis (not a small request) as I'm notorious for slotting things more than necessary or with Enhancements that end up being pointless. Also, to minimize the headache, let's stick to Regular Single Origin based slotting as I'm more concerned about how effective the actual enhancements are. Sure, there's Mids, but that doesn't seem to help if you don't understand what's pointless or not.
I'll try for an example:
Midnight Grasp accepts Accuracy, Damage, Endurance Reduction, Immobilization, Recharge Reduction, and To-Hit Debuff. Now, MY instinct is almost always to go with one of each for powers like this that have a large variety, give or take the amount of Endurance the power seems to take, but it may be that say Recharge Reduction could be pointless as some powers recharge super fast. Taking into account that I generally take triple slotted hasten as my Auto (or not if it doesn't matter), do we have a guide that covers something like this? If not, can we maybe get something that covers a power-by-power as a guide from somebody that understands the numbers very well?
Acknowledging that how many slots you allocate depends on the power choices and character focus, I still feel like there has to be a +/- baseline for most powers on what is useful/essential and what is optional/pointless in most cases. A guide like this would be pretty big and likely in a PDF format or split into individual powerset guides.