Of course, one looks at the subscores. Why wouldn't we? We also look at the whole package to determine if there is something that might explain a poor subscore and whether all things considered, the candidate is still someone who has a reasonable chance of doing well in medical school.
And by "poor" I mean something below 126. (I know that 125 is "average" but a 125 does raise eyebrows).
Depends on the overall score—if it’s 515+, I don’t look at the subsections. If it’s under 510, I look to see if one subsection is significantly lower than the others.
If you pick your schools carefully (hard to say without more information...fill out a WAMC for better answers) and include both MD and DO you should be okay.