When I see a field with 4 or more runners from 1 stable I don't bet in that race. It seems by the small pool in the Kilmore Cup that many others think the same. Around 90% of race fixing or team driving goes unpunished due to it being too hard to prove. It may be rare but the perception is always there when a single stable has to many runners.
I may be in the minority but I would prefer a limit of 3 per race unless there are not enough runners for a full field.