winner at 20/40, loser at 30/60?

Long time lurker, first time poster. [img]/images/graemlins/smile.gif[/img]

I've been beating the 20/40 game for about 1.75BB/100 over 80k hands (4-5 tabling). Recently I decided to started to mix in some 30/60 in and my results have been disastrous.

Over about 25k hands I'm down 300BB for a very impressive winrate of -1.23BB/100. I was curious if there was any chance that this could simply be variance kicking me in the balls, so I punched these numbers into StatKing. It basically told me that there's almost zero chance that I could be a winning player, based upon this run.

So I guess this is a 2 part question. Firstly, has anyone else experienced such a dramatic difference between the 20 and the 30 game? We've all had 300BB downswings before, but to still be down that much after almost 25k hands makes me think there must be a serious flaw in my game that doesn't translate well into 30/60.

Secondly, for people who are playing at these limits, what are some of the adjustments that you've had to make when moving up from 20 to 30? I suppose I can just sit and play the 20 game for the forseeable future, but I think most of us can agree that growing as a player and conquering higher limits is almost as fulfilling as the money we make from grinding it out at a comfortable level.

Thanks in advance for your thoughts.