People suggesting heatsinking for whatever method you use to drop the excess voltage for the red channel are on the right track. You’re talking about quite a lot of heat. It seems like dropping it using a power diode next to the edge may be the way to go.
On covering vias (“tented” vias), see post #426 in the Knucklehead Buck Driver Discussion Thread. I generally crank the limit value up higher than what I’d use and then manually set the Stop anywhere I want it.