Thanks for the feedback Valiant. Anyone who helps out is a prince in my book. On your suggestions I have made a mix of radii tweaks and some extra connections in the down path, and will test them out in a few hours from now.
Hey Crapshoot, hadn't thought about that as a method. I'll try something out to verify it. Since they are high priority tasks it should work on cascaded routes too I expect. The thinking being that if the primary alt-roam and secondary route pair are at a location where the fighting is expected there is a small chance that if the engineers survive the fight that they will be inside the secondary route radius, respond to it and then be willing to fight for the second part of the route.
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OK your suggestions are in
0.05. I still have to verify the engineer fighting spirit.