Sorry Peter, Div 1 is OMR without crew weight of 0.9 and above. Boom without crew is 0.908, actually for Geelong the cutoff was lowered to allow Airplay to race with Div 1. You will have to add a fair bit more weight to keep out of div 1 if that's what you want. 900 kg without crew will do the trick. Perhaps a big anchor and chain?
Boat weights have always varied and it is up to the owner to optimise and make the boat comfortable to suit their local conditions and style of sailing. Unfortunately there have also been some weights that cannot be right due to load cells needing calibrating one year, and in another I can remember a big cat swinging in a 25 knot south-easter with the crane operator yellng numbers from a single cell, so those numbers were doubtful. Again in the absence of a functional national authority, MYCQ as the administrator of OMR is addressing this issue as we type.
Div 1/2 separations in the absence of a functional national authority have been determined by the organising clubs at each event, and I am not aware of any club up in sensible-land putting little boats in div 1, that would be just silly. For all our big events, the F22, F24, F25, F27, F28, F9 (Quickskips/Emarineworld), Sprint, Dash, F32 (Trinket) and even F33 (Pocahontas) have sensibly been put into Div 2. My recollection is that borderline case like Pocahontas was put in Div 1 for the lightwind nationals at Hervey Bay and it was tough for them in the back of that fleet. At Airlie nats they got into Div 2 and won the nats, but did not necessarily get line honours. Consensus was that they belonged in Div 2.
The only little boat that I can remember getting into Div 1 up here was Moving Finger/Dux Nutts, and that was sensible also.