To insert the graph, you need to go to a photo hosting site such as photobucket.com and upload the picture/graph. Then select and copy the IMG option and paste it in your post here.
I'm not surprised by the FR that you report. Yes, it could most likely benefit from a crossover optimization...provided the person doing it is skilled and experienced at the activity.
What you report is a typical example of how many manufacturers report specs that just don't pan out in reality.