I'll never buy into a cash game or a Sit & Go with more than 5 percent of my total bankroll (there is an exception for the lowest limits: I'm allowed to buy into any game with a buy-in of $2.50 or less).
I won't buy into a multi-table tournament for more than 2 percent of my total bankroll and I'm allowed to buy into any multi-table tournament that costs $1.
If at any time during a No-Limit or Pot-Limit cash-game session the money on the table represents more than 10 percent of my total bankroll, I must leave the game when the blinds reach me.

I only play 2 table, heads up, winner-take-all sit n go's. Following chris fergusons general bankroll management rules (above). should i be buying in for only 5% of my bankroll? or can i stretch for 10% because of the decreased variation for heads up?