I see this is qute an old post, please do not use this saddle , if you have continued to. Just because your son is lightweight does not mean that if the horse were to buck or spook suddenly that the webs may not break due to sudden increase in pressure. If budget is an isssue find a second...
Sounds like a bit of an exaggeration, if it has been correctly fitted and is the appropriate tree shape for your horse it should not be causing a problem. Bear in mind saddle fitting is multidimensional and not about width alone, the front to back shape of the tree should mirror that of the...
The saddles differ if you are male or female too - probably best if you get a saddle fitter out so you can play around with all types. Jo Beavis at the National Saddle Centre is excellent -If you call her she explains all the complexities there and then on the phone with no obligation...