Hello , I have beat NL2 4 zoom with 4.5bb/100. I took 7 NL5 shots and all of them failed ( -$35).

What are the mandatory adjustments I need to make to maintain a +EV gameplay?

People tend to 3bet / 4bet really light in and out of position...How to cope with that? Should I 4bet light as well and play a LAG game or tighten up and fold to every 4bet on guys I don't know stats ?

e.g I call 1 out of 4 4bets on a guy and he end up having KK for an overpair winning the pot. Was he bluffing / semi-bluffing on the rest 3 4bets ?

In NL2 I simply waited a hand and never called a turn raise without 2pair+. I also rarely hero called the river 3rd barell. Are hero calls necessary in NL5 as people bluff jam too often to keep a good winrate?

Thanks!! Hope I'll fix my leaks!!

NL2 graph: http://imgur.com/a/ADT7j