Here are Rippetoe's barbell strength standards. I think these are from Practical Programming. Your numbers put you mostly in the novice level.
http://www.crossfit.com/cf-journal/WLSTANDARDS.pdf
There's nothing wrong with the mass gain program but you should probably give SS another try at some point. I think a lot of people following SS start too close to their max and increase the weight too quickly (I know I did the first time I tried it). The important thing is to make small consistent gains for as long as possible.
And eat a lot and rest as much as possible.