More on stem length.
I have allways sized my frames based on a 120mm stem And have always used 120mm stems.
To the OP your not a tall guy if you think a 57 with a 100mm stem will work for you so will a 55 with a 120mm stem and you can always go 130mm if it feels cramped or 110mm if it feels too long.
I’m pretty sure either would work for you and if you have to go longer than 130 KCNC make 140 and 150 stems that are readily available.