According to the chart my pH is slightly high for my amber, that it's closer to ideal for a light brown ale.
It's going to be too high for a beer without much dark malts, but again, you are thinking too much about brewing to your water. Brew what you want to drink, and adjust your water toward what you want to brew. Your water is FINE for a nice light beer, if you just use some acid. Depending on how much dark malt would be in the recipe, you may even want some acid there too.
Now, about the sulfate, you are right, they are low - where you want them. BUT.... when you start adding Calcium Sulfate, you will bring the sulfates up to high. The better choice in my opinion would be use calcium Chloride-that will ALSO raise two IONs, calcium and Chloride, but it won't raise the chloride that much at the levels you need to bring calcium above 50ppm where you want it. Unless you are brewing a really hoppy beer, then the sulfate addition might not be that bad of a thing, but In that case, I'd prob split my calcium additions BETWEEN calcium chloride and Gypsum, giving you a little of each - just favor it toward the gypsum a little. If you are brewing a balanced or a malty beer, you'd definitely rather your chlorides rise than the sulfates.
Don't look at the minerals like whatever is low should be raised. You need calcium and MG for yeast health, clarity, etc. But you also get a lot of what you need from the malts. Bringing Calcium up to 50ppm or thereabouts is a good idea, but after that, you really only need to worry about PH and you'll make great beer. If those things are met, you can also make small adjustments to chloride or sulfate depending on what flavor contributions you want.
I urge you to realize that the water info in John Palmer's How to Brew is NOT accurate. It's been significantly revised. In those days he was worried mostly about sulfate-chloride ratios at any level, and he was kind of obsessed with residual alkalinity -which doesn't matter as long as you hit your PH levels. That water info, including the charts and nomographs, is antiquated logic and not very applicable to present day. John has since written a water book with Collin Kominski and help for AJ Delange where he revises his position.