sounds like you have them adjusted right for now... you will need to fine tune it once you have a tank on it and get wet.jamespitt once bubbled...
any comment on the BP height and shoulder straps.
Don't have the crotch strap tight... but do have the shoulder straps fairly snug... but not tight.... and the weight should be on the waist belt.
When you are diving and horizontal of course the weight will be on your back... and you should be able to reach back and touch your valve handle... adjust the tank to get this right... but not so high that you are hitting your head on the 1st stage.
When you roll to the side the tank and plate should not shift... if they do then the shoulder straps are too loose.