I just got my Vamo and it works but it seems to burn a little hot and makes my attys taste gross. I haven't played with it too much because I have been using my empire clone and beginning to like mech mods. Overall I think if I master the Vamo it would be my number one go too. I always have close to me a Lambo, Vamo, Empire clone, Gs matrix-3 and ego-T. When I go to work its usually just the Matrix and empire but I did use only the Lambo at one point. I got the Vamo to use 18650 batts as the Lambo only uses 18350.
The problem you have experienced happens in N01 mode and is why they got rid of that option on the Vamo V3. Switch to RMS (N02) mode and I bet your problem will disappear.