[windexh8er]

This actually would have nothing to do with the problem (advertised link speed) if Tailscale had more fine grained control over how SR routes are distributed. Currently it's all or nothing and there's no way to ignore specific routes if you're local to that network. Route length trumps network metrics, so it would be better handled in that manner.

In almost every OS I've seen interface metrics will only be used for equal cost route lengths.