I dont know what your issue is.
the over extension tax is a mammoth change to the game and strongly favours those teams who have trained up a group of young players who are now 24 & 25 year olds
I am 3 or 4 games clear in the top league in Australia and have not had to sell any of my current trainees to achieve this.
I have not had to buy any old farts to compete although i still have a couple of older playrs on my team who have been there for a while.
recently I added a 26 yo 196k a week guard and also a 30yo 180k a week centre which I hope will discourage other teams from buying up against me.
These new players are causing me to incur the over extension tax, but are affordable for the short term thanks to the near 100k allowance I get for having trained up players