Your water is very similar to my own. Works great for darker beers on its own. For pale beers I usually dilute with reverse osmosis water 50/50 and add calcium chloride and gypsum to get my mineral content where I want it. Plus acidulated malt to hit desired mash pH. I suggest using Bru'n water, it makes these calculations much easier.
As far as your recipe an increased sulfate level would increase hop perception. But a nice dry hop addition would also increase hop aroma. How long from Brew day till consumption? Cascade in my experience doesn't have a lot of staying power, so best consumed as fresh as possible. I've done Cascade SMaSHes with a similar hop schedule with the addition of a two ounce dry hop and they are always delicious.