|INMA has adjustable tweekers near the shrouds to adjust the angle of the sheet down when required. |
I had similar sail control problems and rigged an effective downhaul but have not tried it out.
For the brace, you need a pole down haul. I have been working on this because INMA's pole is a modest diameter and does not have bridles. So I have planned to rig the uphaul and downhaul to one end of the pole like larger ocean racers to minimise the compression loads on the light pole.
Other RLs have bridles on similar poles to mine but I am not confident mine would survive when worked hard.
If needed, I will put a line from tack to tack on the spinnaker to assist with sail shape and jibbing. We can't end for end the pole with our rig but the RL is light and should not be too much of a problem on jibes.