I need to have the odds of probability to find blocks between 100 and 200 or between 100 and 400 coins.
It's important for me to decide how many coins I should split into different chunks in order to get as highest efficient staking as possible.
Please help with your suggestion on this issue.
Higher inputs do indeed have a higher chance of staking than smaller ones.
But most people split their BWK to 100-200 inputs, so that they will still stake on the other inputs when one of them gets a stake.
And to awnser your last question: Yes, it is twice as likely to stake than a 100 BWK Input.