The mantra is always follow your RA, never ever ever never disobey it. So, you have no choice- either great danger of collision if you do disobey, or obey and increase hazard from terrain. If the RA requires you to significantly use up your MSA safety margin, unless you are over a plateau with high, flat terrain, you may have no problem as the highest peak involved that sets your MSA may well be 30 miles or more away. Therefore, I think obey the RA, cross your fingers behind your back and whistle a happy tune?