If you aren't prepared, don't take the LSAT. Even a modest 5 point improvement in your score (eg 156 to 161) is huge in the eyes of law school admissions deans. You don't want to end up performing poorly and retaking the exam in a year anyway because you didn't get into the school that you wanted to get into.
The LSAT isn't a test that you can successfully sit for if you haven't adequately prepped.
BUT... I don't understand why you can't take the October or December LSAT. You'd rather risk underperforming in 2 weeks or wait 12 months to go to law school than spending 10 hours (round-trip) traveling? I think that you should consider reassessing those priorities.
On the other hand, taking a year off isn't a bad thing as long as you do something productive. If you can get a low-level job at a law firm or (w/ an econ background) a financial institution (esp. IBank, VC/PE/HF) or w/ the Fed, Treasury, IRS, etc. The experience will look good on apps and give you some real-world experience to draw from when/if you do attend law school.