Youth players being made available. Is there a formula??

Hi all,
Like many of you i have played the game for a while now, in season 55
And i am wondering a few things -

I have
4 DC
1 DC/DL
3 DM/DC
1 MR/DR
1 DR/MR
3CM

Why on earth do i get 2 more DC from my youth system when
I need more CM ????

And i had a DR of all things last time i got two new players

At this level its getting harder to win 18 year old players at auction (or even available )

And getting two more DC doesnt help :(

Is there a formula system uses to generat available youth players?

I much prefer to use my own youth players but when i only get a 4.5 and a 2 star when i get new ones.....

Great game overall but wondering if i should start anew..

Cheers
Nig

For what I know it's just random which position your youth player will be.

My personal observation
Whenever I purchased- say for e.g. a MC ( 12 to14 tokens)
The next few batches will be MCs of either 12 or 14 tokens
It will take a while for it to change
Same with the recommended players
It will have the same position players but of different ages, value and tokens pricing