I'm not seeing where your tires are contacting the shock, I do see the dent in the shock body from the top spring plate. Putting the shaft side down might avoid that. Some shocks specify top or bottom others can be run either way. I don't really know anything about samurais but in general you want to use bump stops so that the leafs don't go too far into negative arch. Shocks should also never be used as a travel limiter and bottoming them out,too long of shock, will kill a shock faster than too short, from what I have seen.