My Try another delivery device first. I have had similar issues with the ViVi Nova's as well. They are good, but I think there may be better. Try the Kanger t3 or the EVOD, Kanger Pro tank also seems good. I am still on the fence about getting that one. Unfortunately the last order I made the place I was shopping at was out.
If you want to buy a bigger/better system look around a bit and don't rush into it. I bought the Vamo myself (hopefully it will show up tomorrow or the next day) for me it was at a price point I liked and the features were about the best. I wanted to try VV/VW and I wanted the replaceable battery for the device. I was not overly concerned about the size, I wanted it for home use. With the vamo it uses either flat or nipple top batteries. Get the best you can that is in stock. I also like the option to drop in battery size for when I did want to take it out and about. The main reason I bought the vamo was for the VV/VW I like my vape a little wamer than I could get with Nova's on the KGO. It is pretty good with the 1.8 ohm, but with the VV/VW option I can adjust that no matter what the resistance of the head is and possibly make it better.
I will add this it is cheaper to try 1 or 2 new delivery system than to go and buy another entire system. I would try this first. Using the Nova's I usually swirl it around and make sure the wicks get submersed and a chance to pick more fluid, this has helped me a lot.
If you want to buy a bigger/better system look around a bit and don't rush into it. I bought the Vamo myself (hopefully it will show up tomorrow or the next day) for me it was at a price point I liked and the features were about the best. I wanted to try VV/VW and I wanted the replaceable battery for the device. I was not overly concerned about the size, I wanted it for home use. With the vamo it uses either flat or nipple top batteries. Get the best you can that is in stock. I also like the option to drop in battery size for when I did want to take it out and about. The main reason I bought the vamo was for the VV/VW I like my vape a little wamer than I could get with Nova's on the KGO. It is pretty good with the 1.8 ohm, but with the VV/VW option I can adjust that no matter what the resistance of the head is and possibly make it better.
I will add this it is cheaper to try 1 or 2 new delivery system than to go and buy another entire system. I would try this first. Using the Nova's I usually swirl it around and make sure the wicks get submersed and a chance to pick more fluid, this has helped me a lot.