If you already work in biotech research I'm not sure why you want a grad degree that will help you find jobs... can't you just work in biotech? With 12 years experience, a MS in biology will only be a small feather in your cap, and the benefit will potentially be outweighed by the time it takes to get the degree. If being a physician doesn't pan out, I'd suggest just staying in biotech. If you want to switch out of biotech, that decision should be made after you've totally given up aiming to be a physician.
But it doesn't really matter, because if you want to go to some other program (say an MPH program, for example), you're probably not going to get accepted to start in the program this year, which means you have a year to apply to those programs AND still work on getting into medical school.
If you're serious about being a physician, then I think there's only one real plan of action with three different possible faces: formal SMP, formal post bac, or do-it-yourself post bac.
Looking at your MDApps profile, it looks like you have a GPA problem and an MCAT problem. Specifically, your PS score of 7 is a stinker. To me, this is the most obvious red mark.
Fortunately, for people with a PS = 7,
you can see here that 48% of people who retake the MCAT gain 1 or more points on their PS score. Another 28% have no change.
GPA repair is possible. You might not ever get your cumulative GPA's up as much as you'd like, but you can at least hope for an upward trend. Look for BCPM classes that are relatively easy... "Ethics of Genetic Research," "Nutrition," "Elementary Data Analysis." That sort of thing. A lot of these classes will give you a pretty easy A, and on your GPA they count just as strongly as your O-Chem class or your Calculus class (assuming the same number of credits).
So, yeah. That's my recommendation. Try to repair both GPA and MCAT scores. Do the repair this year, and while you're at it try applying to MPH programs (or whatever catches your interest) for
next year, but do something
this year to repair your GPA and MCAT.
You can probably get these masters program applications sent out in the fall or early winter, that way your late winter and spring are "free" to study for the MCAT, and your late spring and early summer can be spent re-applying.