Thanks everyone. I am finding that my 150% backwinds the main and puts us in a steep heel heel at breezes I would not think are signifigant, like maybe 8 knots true. I finally installed a wind speed indicator so I'll be able to see exactly what apparent and true wind speeds cause the issue.
The boat is 30 feet with a 37 foot mast. I don't have lots of space on board for too many sails, so I'm hoping to find a size head sail I can use from 8 knots up to maybe 15 or 17, when its time to use the 95%.
As someone here said the 150% makes a good light air head sail.