Okay, yes,yes, you could call the nacra office, that's the most carefull solution.

But, having suffered from the design errors from Nacra, I've learned to use my own common sense:

Take any traffic-bridge; they are always prebend in their structure . This pre-tensioning is quite logical because when loaded,you don't want to charge the construction directly with a bended sag (and its belonging tensile load on the construction parts)

So, prebend is the solution for all this misery! (Then the load will automatically be led to the side with pushback forces on the bolts ;as you have experienced just now)

Prebend with no load on (mast off) is only possible with sufficient tension on the dolpin striker. Tensioning the rod, feeling the bars of the dolphin-striker at the same time and looking at the frontbeam will give you a pretty good idea of what is needed.

So, my suggestion is look for a small centimer prebend!

I bet with you that all comes together with a few mil play in the bars.