Wide metrics for eigrp lab not working for path selection

I can successfully manipulate the eigrp metric to move traffic through form host 9 to host 10 via the dmvpn but when the tunnel is down, i cannot get reachability between host9 and host10. please help

I know this is an old post, but I had the same issue. And based on my observations it seems that if the delay is set too high, the metric hits its maximum value, which results in it being marked as infinite in the EIGRP topology table, and the route doesn’t get installed in the routing table.

So, in the end, I decided on a metric value that made the route less desirable ( i.e higher than R3-R5), then used the formula to derive the delay from it, and it worked.