2 x 75 or 2 x 100 is conservative but a completely reasonable approach if you ask me. Better an abundance of caution than a deficit. Your ROR should be minimal with 300 or 225 max bets playing in a game with liberal rules and a good cut, especially if you have a plan to resize downwards on a bad downswing. To maximize your hourly try to play at off peak times when you can find heads up games and play all.