I noticed that the new levers are more sensitive to misshifting/slipping to a smaller cog when you slightly touch the top paddle.
I puchased the new shifters online to replace my crashed levers. My old levers did not do this unless you obviously press the top paddle...so it has more tolerance.
I have verified this with my friend's 2010 and earlier bikes that they are not sensitive to this, as well as new 2011 bikes at the LBS and they are more more sensitive to this issue.
I have contacted the rep at Shimano and they are not aware of this change. I guess its time to change the way you shift especially when you are at your final lap at the race.
I guess Ill say hello to SRAM Red if money is around.