I finally did some computations for era adjusted statistics. I used 1981/82 as a baseline year since that is the season when the goals per game was highest. It's also the season that Gretzky had 92 goals. Since that's the baseline year, his 92 is the equivalent of 92. But I also factored in length of season. I ignored the number of games played by goals scored leaders for particular seasons since durability is a part of the game. It also can be come subject to smaller sample size.
So, according to my analysis, the top 5 era adjusted goals per season by an individual player are as follows:
1. Phil Esposito 70/71 --100.18 goals
2. Brett Hull 90/91-------99.67 goals
3. Gordie Howe 52/53----93.57 goals
4. Wayne Gretzky 81/82--92.00 goals (baseline year so it's one to one)
5. Alex Ovechkin 07/08---91.47 goals
Other items of interest...
Stamkos's 2012 season ranks 10 at 85.98 goals
Milan Hejduks league leading goal scorer season in 2003 ranked 32 at 73.82 era adjusted goals.
Bear in mind, that I've done no tweaking for strike/lockout years.