Couple questions for those who play lots of online cash. First off, I play online in NJ and am pretty certain that the skill level among various stakes is much weaker than what you would find on international sites like stars. Lately ive noticed a pattern in that I can crush games like 2/4 online but am having a very hard time beating 1/2. This isnt a huge sample so its possible alot of it is variance. I have about 20k hands at 2/4 and 30k at 1/2 on this computer. There seems to be a divide in the play at these levels.

Is it possible that significant changes with regard to strategy have to be made in order to adjust to different play over an entire pool of players? 

Could my strategy at 2/4 actually cause me to be only a slightly winning player at 1/2? 

Has anybody noticed similar things at other levels and what changes did you make in order to adjust?