Whenever we do this evaluation (and I think we did it a month ago), I find it hard to separate performance and performance elevated from regular season expectations. Some of the elites don't necessarily see their stock rise in a playoff evaluation the same way a Claude Lemieux does - of the top-15 scorers of all-time, only Mark Messier sees his point-per-game production increase in the post-season (and this was true even prior to his post-1997 regular season adventures).
With regards to the bolded, I took a fairly crude approach in trying to figure this out. I compiled a list of the top 100 players with the highest playoff ppg (minimum 50 gp). Then compared their playoff ppg to their career regular season ppg. This is a list of the top 20 in terms of elevation:
Player | Pos | PO PPG | RS PPG | % Improve
Jude Drouin | C | 0.94 | 0.68 | 38.24
Steve Payne | LW | 0.99 | 0.76 | 30.26
Craig Simpson | RW/LW | 1.01 | 0.78 | 29.49
Danny Briere | C | 1.01 | 0.78 | 29.49
Claude Giroux | RW | 1.1 | 0.87 | 26.44
David Krejci | C | 0.91 | 0.73 | 24.66
Kevin Stevens | LW | 1.03 | 0.83 | 24.1
Darryl Sutter | LW | 0.84 | 0.69 | 21.74
Brian Leetch* | D | 1.02 | 0.85 | 20
Toe Blake* | LW | 1.07 | 0.91 | 17.58
Mark Messier* | C/LW | 1.25 | 1.07 | 16.82
Martin St. Louis | RW | 1.08 | 0.93 | 16.13
Gregg Sheppard | C/LW | 0.88 | 0.76 | 15.79
Valeri Kamensky | LW | 0.91 | 0.79 | 15.19
Saku Koivu | C | 0.87 | 0.76 | 14.47
Ken Linseman | C | 1.06 | 0.94 | 12.77
Steve Shutt* | LW | 0.99 | 0.88 | 12.5
Dave Gagner | C/LW | 0.84 | 0.76 | 10.53
Paul Reinhart | D | 0.93 | 0.86 | 8.14
Some other notables:
Player | Pos | PO PPG | RS PPG | % Improve
Sergei Fedorov | C/RW | 0.96 | 0.94 | 2.13
Jean Beliveau* | C | 1.09 | 1.08 | 0.93
Bobby Hull* | LW | 1.08 | 1.1 | -1.82
Gordie Howe* | RW | 1.02 | 1.05 | -2.86
Evgeni Malkin | LW/C | 1.17 | 1.22 | -4.1
Wayne Gretzky* | C | 1.84 | 1.92 | -4.17
Peter Forsberg | C | 1.13 | 1.25 | -9.6
Bobby Orr* | D | 1.24 | 1.39 | -10.79
Guy Lafleur* | RW | 1.05 | 1.2 | -12.5
Mario Lemieux* | C/LW | 1.61 | 1.88 | -14.36
Mike Bossy* | RW | 1.24 | 1.5 | -17.33
Steve Yzerman* | LW/C | 0.94 | 1.16 | -18.97
Defensemen only:
Player | Pos | PO PPG | RS PPG | % Improve
Brian Leetch* | D | 1.02 | 0.85 | 20
Paul Reinhart | D | 0.93 | 0.86 | 8.14
Doug Wilson | D | 0.84 | 0.81 | 3.7
Al MacInnis* | D | 0.9 | 0.9 | 0
Paul Coffey* | D | 1.01 | 1.09 | -7.34
Denis Potvin* | D | 0.89 | 0.99 | -10.1
Bobby Orr* | D | 1.24 | 1.39 | -10.79
Raymond Bourque* | D | 0.84 | 0.98 | -14.29