The only strategy on any roulette table is to follow the statistics. I found an incredible website called playsmart247 that gives me all the stats and live results of 4 Evolution roulette tables. I use to lose on a daily basis on Auto-Roulette. Well all I can say is now is that I am playing with more confidence just by following the statistics. It works
Every online casino operator can tweak their RTP as the wish. Having said this, they have to be clear with the players. If a slot has been tweaked at 85%, they are in the obligation to write it on the specific slot description.