Liquid Nitrogen Ice cream Melting too fast!
I used to use a cream and condensed milk recipe to make LN ice cream. It sounds like you're not using enough LN - while you should end up with something scoopable it takes quite a bit of beating to get there.

We tended to work as a team, with one (often me) beating as someone else slowly poured in the LN. This minimised solid lumps (which then needed to be beaten back in). Getting it slightly too hard and then allowing it to soften to the desired texture seems to work well.



In this case I'm the one holding the bowl, while one person stirs and another pours.

You're also probably making it harder for yourself using milk, as the high water content means you'll form much more solid ice.