I used to be in a situation similar to yours, and to be honest, there's nothing you can really do to make your game run as decently as you want short of buying a new computer. The best thing you can do is find a config and tweak it to your liking. I know you said not to recommend other configs that are floating around out there, but if the config is comprehensive enough, then you basically have all the commands at your disposal to make your game run as best as possible. I used to use Chris's configs, and there were comments for many of the commands so that I could adjust them accordingly. I think Comanglia's config is pretty popular nowadays, and after looking at it, it looks to have all the commands you need.
Other than that, you could run the game at a lower resolution (1024x768 or 800x600), make sure you don't have any unecessary background processes running, or save up for a new computer.
Again, there's no magic setting(s) that you can take advantage of to make your laptop run TF2 as you wish it would. I don't think there's any hidden setting not found in any of the already established configs/threads that would cause TF2 to run at a stable framerate on a computer as underpowered as yours.