Romelee,
LOVE YOUR AVATAR !  I may steal it when you're not looking...   
Congratulations on the setup.  I'm sure you're loving it.
I recently got a Vamo and am also using carto/tank setup.  When I bought the Vamo, the supplier set me up with a single 18650 and 2x 18350's.  He was actually recommending all 18350's, but I told him I needed to try both options.  The stack of 18350's supplies double the voltage(8 vs 4) - a warmer and wetter vape.  Mine are also Efest batts.  I just wanted to point that out so you may try it later.  If you are adding batts, a lot of advanced users prefer MNKE LiMn high drain, fyi.
DickyG:  that's a common issue.  Most 
tanks spin, and I have to look that up because I'll be getting some spinning 
tanks pretty soon.  However, my first 
tanks were Smoktech UDCT's.  With this tank and the Smoktech carto, there's a locking mechanism on the bottom.  It's a little more fiddly when you refill (have to remove tank from the device), but it doesn't spin.  Overall, I'm satisfied.  The tanks are only $10 and look fine sitting atop the vamo.  They have gun-metal and chrome finish.