I think with a two tier comp, the gap would be too large and you would end up in the same situation with the promoted team coming up.
Is the gap from 17’s to reserves too big ?
Say have 19’s Reserves and Firsts on a separate day. That way clubs can hold onto older experienced players in reserves and have a blend of the better youth and a strong 19’s comp ?
The younger reserves now would be some of the earlier association SAP squads just hitting senior football or dropping out in a crowded senior league once they age out of 17’s.
Keep the 8 team comp, There’s plenty of youth coming through. It will build, It may be harsh on some teams now but with better coaching through the youth it’s only going to develop.