Maintain makes some great points and I am just going to add onto what he said.
First off the difference between a 3.14-3.29 does not mean much. .15 points on your GPA is not going to make or break you and more importantly there is nothing you can do about it anyways.
For now do everything you can to get the best LSAT score you can and once you have that score and your GPA you can realistically assess your options.
The real issue I see in your post is that you want to attend a school in the 70's and I see this mistake all to often from 0L's and I had the same mindset when I was a 0L, but I can tell you that the rankings mean very little remember U.S. News is a for-profit, unregulated, magazine offering an opinion do not make a life altering decision of where to attend law school based on it.
Remember U.S. News ranks more than just law schools and according to them Albuquerque New Mexico is the best place to live http://money.usnews.com/money/personal-finance/slideshows/best-places-to-live
. I imagine you would not plan on moving to New Mexico because U.S. News said it was the best place to live use the same logic when choosing your law school as 1) Location 2) Cost and 3) Your personal feelings about the school are far more important than what a magazine says.
Since you are attending UCLA I assume you will want to attend law school in California and with between a 3.1-3.3 GPA and a 147 diagnostic on your LSAT you are likely not going to attend law school at USC, UCLA, Stanford, or Boalt. There is no shame in that plenty of successful attorneys did not go to top tier schools.
With your GPA and assuming you get a 155-160 on the LSAT and you want to remain in L.A. you could attend Pepperdine, LMU, Chapman, maybe get a scholarship at Southwestern all of which are fine schools and I have worked with great lawyers from each of those schools.
In the end you really need to not worry about the rankings they are arbitrary and nobody cares about them unless you are attending a school that is truly elite and just use common sense when considering your law school options and a key step in using common sense is not making a life altering decision based on a magazine. To further bolster this argument you can see how much the rankings change year by year and how arbitrary the 70th ranked school would be http://www.top-law-schools.com/rankings.html
Loyola for example was in the 70's in 2008 shot all the way up to 51 in 2012 and last year dropped to 68 what happened at the school over that time you ask? Nothing same professors, campus, etc existed, but U.S. News is based primarily on people across the country filing out Scrantons from 1-5 that is 60% of a schools ranking if you think that is something you should make a life altering decision upon go for it, but odds are you will be disappointed.