There's not really enough information here to do much more than guess. We don't know anything specific about the boat and no clue as to the original stability curve. A lot of designs don't have a very real or accurate set of stability calculations even at low heeling moments, much less to 110 degrees or more that's good if you really want off-shore happiness.
If the plan is to use the boat along shore, not venturing around the stormy capes and all, then just carrying on with the rig and then learning empirically what her heeling moments at least to somewhere past 45 degrees and calculating the rest to figure just where she goes to negative stability seems warrented.
After all, you've gone this far without predictive engineering. Might as well carry on and hope she can carry the sail. If she's really a heavy boat, the added weight aloft will only raise the center of mass a little and should not do much harm.
G'luck
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