Instead of changing it, try not to spend so much. For instance, when you start a new game, set social to zero, and after you have a number of planets, increase social. You'll have more income by this time, as well as a larger population base. Also, early in the game, don't build social projects or ships that have a maintenance cost (unless you've got a particular strategy in mind), and don't Purchase anything with a Lease (except, perhaps, some Colony ships to get a leg up).
If you need some scratch immediately, try selling some of your tech to another race... or, if you've got a decent warfleet, bully some minor civ, then demand tribute to end the war (even better to bully a major civ).
Since the game's turn-based, take your time. Set the AI to Fool and Neutral alignment... then just worry about your own backyard for the first several game-years.
~SDC~