I don't understand your maths here....
The way I look at it is that after 21 games:
Corr has made 12 starts and 6 substitute appearances and scored 7 goals in the league.
Sturrock has made 15 starts and 3 substitute appearances and scored 4 goals in the league.
If we extrapolate this over a whole season Corr would end up with 15 goals and Sturrock would end with 9 - a total of 24 between them. I don't think this is too bad of a return, and with fewer injuries in the second half of the season I would expect their goal totals to be higher than that.
Everyone wants to see 2 strikers banging in the goals but you need one hard working player putting himself about upfront too...if they are also a goalscorer they wouldnt be in league 2
They have made 27 starts between them and scored 11 goals between them. If both were to play every game in a 46 game season and score at that rate they'd play 92 games between them and score 37 goals between them.
Or if like Brett Angell and Ian Benjamin they'd played 83 league games between them in a season, Corr and Sturrock would score 33 goals. When Angell and Benjamin played 83 league games in a season they scored only 28 goals.
The issue hasn't been the 27 games they've played during which they've scored 11 goals, it's been the 15 apperances they haven't made during which our forwards have scored just 2 (Midson at Cheltenham).