Moving from 100NL to 200NL

Ok, so I havent posted here in a long time. I posted a little bit a while ago when I was playing 10Nl and getting my feet wet in 6 max NL and way back when I was playing 6 max limit.

I worked my way from 5NL to 100NL and have a br of 3.7k now. I am about to make the transition to 200NL. Or at least take a 3-4 buy in shot once my roll gets to 4k. I have played 11+k hands at 100NL and am beating it for 6.47bb/100. I know its a small sample size.

I have always used to 20 buy in rule, but now with more variance at higher levels do I need to increase the number of buyins in order to move up? BTW i play 19/16/3 game so its pretty low variance game.

I play on stars. Is there any big differences between 100 and 200NL? What is your guys overall opinion about 200NL on stars? Any suggestions about opponent tendencies that might differ from 100NL to 200NL? Any suggestions about making the transition would be helpful. Thanks.

The move to 400 is harder.

i definitely recommend more than 20 buyins but from what i noticed in my move to 200nl last week was that everyone is way more aggro, including the bad players. but, just because they are more aggro doesn't mean every 3 bet is a move.