Best way to deal with the tail wag I find is to fly the freaking heli. I just bought this to learn collective, so I am hovering a fair bit, but its not so bad that I would think about sending it back. I read about it I knew it would be present, its not like a guy cant find out about this issue in five minutes on his phone.
If your buying a heli to hover in front of your face, and a little to a lot of tail wag is going to bother you, this is not the heli for you.
If you want a balls to the walls powerhouse 3d trainer(cheap parts, no 130 tail issues), that suffers from a bit of wag at times, then this may be the heli for you.
I have never seen a tail motor controlled heli that did not exhibit some degree of wag at some time during the flight, always just accepted it, sort of a trade off,less parts, simplicity, cheap, you get a bit o wag.
Jam the stick forward, it goes away.
PS: after a read I need to add, I did not mean to sound attitudy??? so rather than rewrite.... I just want to make the point that sometimes we overanalyze and obsess over things that maybe shouldnt matter so much, this is one of those time, I think. If you find yourself worrying about the wag more than having fun flying than you either need to accept it or work to change it, and thus I guess we come full circle to the point of this thread.
Have fun and good luck.