@IPOFreak Basic idea is similar to SME IPOs - each lot size goes into individual lotteries. In Mainboard, all lotteries have same probability so generally there's limited value to applying larger lot size.
But a lot size enters lottery if there is atleast as many applications as half the overall subs. In this case, since the issue oversubscribed 7x, any lotsize that has atleast 4 applications will enter lottery. So if you are the only one applying 4 lots from a particular lot size, you will definitely get allotment.