I am not exactly sure what you mean by this. Are you asking if the structural integrity is compromised if it is bending while the sail is cathing the wind? Or are your worried about a permanent bend in the mast at a specific location?
I am going to assume, for answering sake, that you are worried about the mast bending because of the wind loads created during sailing. The thing that you need to understand when considering this scenario, is that all materials will bend or give when non-concentric loads are applied to them. If you do the math, physically a member must bend to transfer perpindicular loads. This is a simple Statics and M of M principle. If you are not familar with this, it is not of concern I just wnated to give you some background before I go into my next statement.
What I really see as the failure points in a situation where the mast bends, is almost anything other then the mast which carries the load from the mast. Meaning, the loads that will cause a mast to have permanent deformation or cause a catastrophic failure will more then likely cause something other to fail first. What I suspect will fail before the mast does, is the connecting clevis pins, a worn stay, or a failure at the chain plates. So I would not worry about a little mast bending.
As far as getting the most prformance out of your setup, I would try and contact other owners with the same setup to see how they sail, what the max winds they sail in, and how soon the reef. I know that is why you are posting the question here, but I would have to assume you will run into someone with the same boat sooner or later and this would be a perfect question for another owner.
Hope something in here was of some help. If not, good sailing.
