Explain to me where you got 160%? It's only a 60% bonus.
60% exp gain rate means you're actually going slower. I'm calculating the fact that you get 100% normal exp gain + 60% from the doctrine ability which adds up to 160%. 1.00 + .60 = 1.60 exp rate.
If I had said 60% speed, it would mean the doctrine ability actually lowers the rate in which your troops gain vet.