I am going to dissent with the rest and argue for the double major.
If you continue studying at your current pace, you are guaranteed to get a double major. However, even if you devote all your resources to studying for the LSAT, it may not result in a higher score. After all the studying in the world, you could mess up one logic game or a RC section and lose that several month investment that could have gone toward a double-major. So the double major is the safer bet.