Atlantis at 50 is pushing it!
40-45 seems to be the limit before the wick can get fried
For me 35 is a really nice level and I have used it with high VG and 50/50
Curious what tank you use 5 Watts at, that you would want to use on a higher end regulated device
Even on my Nautili's Mini and PT2 tanks I still use 10-12 W on the Vamo