Join Date: Aug 2009
Location: New South Wales, Australia
A seven inch gullet means it's likely Full QH bars, which means the angle of bars are flatter. This means that only part of the bars will be in contact with the horse (if the horse is too narrow). Putting more padding under this won't make a difference. Semi QH bars will have a steeper angle that is more likely to fit your horse. If it's just matter of width and not angle, then you can use a built up saddle pad to lift the front, or shim a saddle pad, but an ordinary pad won't do it.
You can download templates online, like on HorseSaddleShop where you print them out, cut them out, stick them together and use them to measure what bars would fit your horse. It might be a good idea to check them out.