Your setup is perfect. Heck, better then mine! Personally, I think you don't need to change a thing whatsoever. The pellets are good, probably no need for safflower seeds unless the birds eat them. I know with mine, they would just kick them out. Either or. Also, I would recommend having a separate sprout mix. Not necessary, but provides more protein the normal budgie mix. In mine, I have bandicoot oats, sunflower, chick peas, wheat and... something else. I dunno. You probably don't need the calcium block in there if you have the cuttlebone as well.
Otherwise, keep it as it is!