Hi.
I don't have such problem at all.
Even 9 players work good if you:
1) strictly follow depth chart;
2) put all your four players to different positions to Backups or reservs.
It means that all 4 nontrained players have it's own backup and only one wihtout.
It's a key.
I know all of that, and it still doesn't work...
example 1
game
(94795538)trainee Ivan Šupić on PG position, 47'
lineup:
(http://pokit.org/get/?0ebd5fe517c452da608c7019e899ed91.jp...)only 9 players in game roster, but game was a blowout.
in last q only reserves played, and in last minute, coach start to random sub trainee with other outside players (SG/SF)
example 2
game
(95704207)trainee Bošnjak on PG postion, 46'
this time only 7 players in roster, but again blowout, and same random subs in last 2 minutes...
example 3 and 4
games
(94795556) (94795563)close games and no problems, trainees Šupić and Ćivić played whole +48' on PG position.