From lifespan point of view, it does not matter if you run a SWG for 8 hours at 50% or 4 hours at 100% it is still 4 hours of SWG run time. So yes, you can increase the % setting if you need to but it will impact the life of the cell. However, with an 8 hour run time, you should be getting over 1 ppm residual so it could be the chlorine is killing some algae in the water. A shock might help this.

Ph is a little high. I would target 7.2-7.4 which will allow the chlorine to work better. Alk is a bit high but when you lower PH, that will come down as well.

If you are smelling something that is usually CC so a shock may be in order. However, I would do that with liquid chlorine to save on the life of the cell.