Title says it all really.

I keep opening new games to try to find a horse with max potential, but how do others do it? OR do you have that many horses that it never really happens? I try to keep to around 20-30 per game and I have about 4 or 5 games going at one time. But I'm finding my staying lines in particular have already reached a peak, after only about 10 seasons. I'm really struggling to find anything to try to breed into them that won't compromise the max potential bar, so far unsuccessfully. Hence the question...

Its the toughest part of the game
your breeding can go wrong at anytime
i have just come across this
if you give it 2-4 seasons and you don't produce anything better in ck you need to start over
you can waste alot of time on dead breeding lines
i always keep a stallion back for this reason so i can go back to him if the others become dud in stud
sometimes you are fighting a losing battle with breeding
you just have to start over

I thought my breeding lines were sea as nothing I was producing was beating what I already in league this season, but now I have too stallions which are 5-6 lengths faster than what I have, me personally I try to use the best of the game horses to freshen up my lines which I find works but only produces a superstar every 5-10 seasons with exceptions now and then. Without having loads of saved games and quitting and going back into games to use stallions and mates over and over. I find this way beat effective for me.