Yes. I usually have a notional ball-park figure of 10lbs when anticipating improvement either from hurdles to fences or from novice chasing to second-season chasing but we're usually looking at younger horses when we do that.
The RSA last year was a good one, not far off Might Bite's on my figures and Percy did it easily enough. The big question is whether he can improve at his age without any further experience of chasing. I wouldn't rule it out, mind.