There are a couple of loot mods like Scarcity (personal favorite, makes treasure and coins feel rare), don't forget Morrowloot and there is Dynamic Loot and More Interesting Loot. Also if you are up for it, editing the loot in Creation Kit is actually fairly simple. You just load up the files, and edit the containers and the markers that say loot. For example you could make a large coin purse have 1,000,000 coins, score!