Bighorn is a decent brand, and about the best cordura saddle you can buy, in my opinion. But I used to have trouble with mine digging into my horse. Because the skirts are soft, there is nothing to keep the tree from digging into the horse if the tree doesn't fit perfect. So, what I would say, is if the tree fits your horse perfect, it is a good saddle. But finding a perfectly fitting saddle can be a nightmare sometimes. Or maybe I am just unlucky that way.
I am the same height as you and overweight and I actually love high cantles and wade or A-fork trees. A wade or A-fork gives you lots of thigh room so you should never feel claustrophobic. But, if you don't have luck with the high cantle, you might want to look at roping saddles. They are generally pretty low in the cantle and have a flatter type seat. Before I discovered A-forks I rode in roping saddles. And because all sizes of people rope, you can usually find them in larger seat sizes too.
If you feel like your saddle is going downhill, it might be too wide for your horse. I HATE that downhill feeling and have sold a couple saddles for that reason. I now have a saddle to fit the horse I was having trouble with and the saddle that fits her well is level in the seat. So your "downhill" saddle might just have been too wide for your horse.
You might also want to look at Tucker trail saddles. They come in a lot of variations and larger seat sizes and I know a lady that has a couple and loves them. They have always been a bit too pricey for me, but if a nice used one ever came my way I would snap it up. Sometimes (well, pretty much all the time) you are better off with a quality used saddle than a cheaper new saddle. And quality used saddle hold their value pretty well too. For instance, if you got a used Tucker you could probably resell it for what you paid for it. If you bought a new, cheaper saddle, you will loose money if you have to sell it. That goes for all saddles actually. If you are on a budget, go used and then if it doesn't fit you are much more likely to get your money back out of it.
Last edited by trailhorserider; 08-24-2013 at 08:59 PM.