erm, based on DMM's recommended level to 1*: 1 = E, 25 = N, 50 = H, 50cc25 = X, 50cc50 = G.
if you play nutaku aigis, you'd note that daily missions are tiered in that manner (monday daily's Golden Armor E, Golden Armor N, Golden Armor H. X and G only exist in dmm version atm)
so yeah 40/3 = H map. I myself tried it but somehow it hasn't been dropping well for me. gotten better rates from the 70/6 G-tier map, or so I feel. also, they generally don't need AW units to clear, at least not until we reach those special event maps like last week's majin furfur.