With a wallet holding 1.5M hbn you have this value as max for combine & split
combinethreshold 7000
{
"amount" : 6127.10000000
}
splitthreshold 7000
{
"amount" : 3063.55000000
}


The #1 have 2.75M, nearly 2x mine, soo his max should be around 12k for combine & 6k for split

Only way to have higher value is 1) modify and compile yourself the wallet or combine your block manually and no other way to have a splitthreshold of 24k