I think if you made races of 6 starters or less penalty free it woudnt make that much difference, 4 in the main race at Cambridge, nothing will change for the winner but the maiden trot in Nelson, would anyone of those win at Methven, Motukarara against 14 others, probably not, no one can manipulate the field size, itsI just one of those things that happens now and then, i don't know if there is a ratings rule but fillies and mares should only get half points for winning too if they are restricted to one sex, probably in reality you could also reduce the rating penalty to 3 points if there are 7 8 or 9 starters, even reduce the top rating to 80 and exempt any horse from a ratings drop for 4 starts after a penalty bearing win.
Once upon a time there were 10 classes, no drop back, was it right that's subjective.