You could argue that recently he hasnt been getting many and this obviously is his frustration which means he turns to shooting from 20 yards although he has still been in good positions. I agree his finishing can be slightly better but since the fulham game his game has gone a bit downhill (I think he was thriving as the lone striker but Ade's return has hindered him).
You could also say he hasn't been making intelligent enough runs into the box to be found and score tap-ins like Hernandez has been. You can spin stats a millions ways!