I always get burned by too much mast rake in light winds. My rig sails faster fully powered up in light winds. I'd go as straight up as the chainplates allow for 3 to 4.

I'd use less batten tension and hope for the best. Mono hull sailors would use more sail shape in light winds and less in strong winds. Cats with more speed will cause wind to become unattached in light winds if the sail shape is deeper. However - 3 to 4 is very light.

I'd try the traveller both ways. Good luck.