I got a 153g and 163g R-pro Boss the other day and are still more stable than I thought but do really like the grip on them. I do like the 163g for forehand though compared to my 175g Champ. I don't think I can flip the 153g backhand unless theres a big headwind. I think I still like my Star Boss 175g the most because I can forehand and backhand it consistently.
How far can you throw? How much power are you putting on the 153g? I'm considering getting a few really light ones, but am curious about their stability at those lighter weights.