A few things.
Actually, your
LizzyM is 70.4. With your GPA, a LM 72 would be closer to a 513-14. If you look in the threads regarding people without II, many of them fall in that same LM range.
Now to the next point, define "fairly competitive".
Your MCAT score doesn't fall in the IQR for most private schools in the 30-50 range. It does for OOS publics, but they often have bad chances for OOS (e.g. UAB interviews 175/4000 OOS vs~40% of IS). They aren't realistic targets for most people, unless you have very high stats, ties to the state, or something phenomenal on your app.
For most people I know, myself included, who are ORM, "fairly competitive" means MCAT and GPA at or above the school's medians.
Stats matter. A lot. They're not just a "once you get in a certain range, it's all your app". If you don't believe me, I've talked to admission committee members during the cycle.
If you're aiming for a T50 as an ORM, I wouldn't expect a lot of success with a 511, unless your EC's are well above average.
On the lower end of the IQR (~25-35th percentile), you really need something to stand out. There will be at many of the schools you apply to, thousands of applicants with similar or higher stats. Many of them will also have research, service, clinical experience, etc.
"Solid" may not be good enough. If you don't have a hook (athlete, URM, research fellowship, unique experience that no one else is going to have, etc.), at schools with 8000 plus applications, it's not easy to just stand out. Especially if you're on the lower end statistically.
I don't say any of this to be mean, but to give you a realistic idea of what to expect and so that you don't feel disappointed later if it doesn't work out. I've seen plenty of people with LM 70-71 not get any interviews, or get a few interviews and not receive acceptances.
If you do retake and score a 514-515, you would be far more competitive for the T50 with your GPA.