[mikechops]

Game theory says there is an unexploitable strategy for every game. This is known as the game theory optimal strategy. It may be possible to increase your win-rate by diverting from this strategy to exploit opponents not playing the optimal stategy. But if you do this, you will lose to an opponent playing the optimal stategy.

The complexity of poker is such that nobody knows what this optimal strategy is yet, but we do know that it does exist.

It would seem to me that as you progress up through to the tougher games, the strategy you need to beat them, will have fewer exploitable weaknesses. In other words your game should be closer to the game theory optimal strategy.

If this is so, you should still be able to win at lower limits by playing the same game you use at the higher levels. However, someone adapting to the many weaknesses of the opponents would have a higher win-rate.