The reason why we choose less than 50% as a default setting is because we want to find companies that have the ability to increase their payout ratio every year. In theory, if the company is payout dividend less than 50% of its profit, it is more likely they have a higher chance to pay more in the next year. Even if, next year revenue was reported lower, they can still pay more in term of percentage.
Example: Company earned total 100 Baht profit, dividend payout is 50 baht and the last 50 baht was kept as profit. Next year, the company earned 90 baht in profit, the company still can pay dividend at 55 baht, while left over with 35 baht. In contrast if the company decided to pay out dividend at 90 baht, next year their revenue is down to 90 baht their won't be able to pay dividend at 90 baht but maybe 80 or 70 baht instead.
You definitely can change the Dividend Payout Ratio setting to be at 60% or 70%, but the chance of you gaining a growing dividend payout ratio will also be reduced as well.