hand 1. What % of the time do you think an unknown who limped the btn is going to fold when you make it 0.15? And how often do you think you need him to fold to make it profitable to raise KQ OOP? I don't have nice pat answers to these questions. The main point of asking them is for you to ask them and to see if the answers you come up with paint a coherent picture. If not, then you can think about whether betting more or checking behind would give you more coherent answers.