Jim, that looks strong. We do think that the wheel is moving rear ward during braking when using uprated rubber, and also the racer had a wishbone mounting failure in the early days, but I do not know which mount failed, the strut or main arm.
So what you are doing should combat the issue of strut weakness. If the main arm is able to flex I cannot see there being a problem with it.
My next task will be to source a spherical bearing for the strut rod to better support the inboard end.
It is a pleasure following your journey.
M