That is, what are the ideal parameters to better improve income.
There is no ideal parameters for the bot, it always depend on how market behave in the future and how your pairs move. You can experiment with your bot though, which one is better for your trading pair and current market condition by running several grid bot with same price range but different number of Grid. Try use small (2-15), medium (16-40), and high (41-99) number of grid at the same time and compared the result by yourself. Different market will give you different result.