It is not that Dave from innova refuses to make Starfire's at low weights.....it is that it is imposible to make starfire's at this weight. Right now, dave is only able to produce pro starfires at 165g.
Wide rimmed discs such as the starfire, orc, wraith.....etc. have so much weight on the rim, that the flight plate would be to thin (or nonexistent) if he attempted to make them in 150g. DX plastic is easier to produce lighter weights, but the starfire does not yet come in DX.
Sorry to break the news to you, but I doubt starfire's will ever be that light.
Practice, practice, practice. Especially with players that are better than you. It's one of the only ways to learn new things.