ok, I am not a Master but had to put my thoughts in on this. One thing I have learned is, if you set a hard limit and you are being pushed on that limit and your partner doesn't honor your limits then stop the relationship. Trust is essential in these relationships. If you do something you are against, your trust for your partener will diminish and the relationship is pretty much lost. That's not say you can't overcome this, but really DON'T compromise on your hard limits.
PM me if you wish to discuss your concerns.
subwife