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If you back you should really go down and shorten reach (as mentioned above). Unless the fitter is suggesting otherwise.
Shifting weight back can have a big difference to how you balance. I think my fit has rotated forward incrementally between setting up bikes. When I started a re-fit from scratch I lowered and backward-adjusted my saddle, raised stack and shortened reach my bike handling was easier (riding and steering no-hands went from feeling tricky to natural) any the hand-numbness disappeared on all but 5hr+ rides.
Went to a cycling podiatrist/fitter the other day for some custom insoles. He noted my knee is quite far beyond the pedal spindle and that I sit quite far forward (on the narrow part) of the saddle, and that it might be beneficial to move the saddle back so I can sit "on it" more. Has anyone done this? I feel like moving it back would only mean I sit further forward on it.