I don't think the pain you're mentioning is because of SPD specifically, but more just being a little more tender due to the extra blood flow in those areas in pregnancy. Maybe try going very slowly, (explain the issues to your DH, although if he's reading this thread, then I guess he already knows! Hi Mr. Frankie! ) communicating clearly about what is good and what is not good,and use something as a lubricant? And have him stay away from the boobs if they are very sore.
HTH!