sorry about not seeing this until now, when you set your steep time hops, you hve to make sure you adjust the temp down to 170ish range. you should not be getting any IBU additions from the hops down that low of a temp, or if any at all it should be very minimal. To adjust the IBU down, drop the boil additions down to the 5 min mark vice the 15min or maybe down to the 10 min mark.
when I am creating a recipie, I usually figure out what I want my ABV, SRM and IBU to be in the end product, and then when adding the ingredients, I play with the malt to get the target OG set (then I usually add just a tad bit past but thats based off what I know I get from my mash efficiency etc) then I start adding the hops. It usually takes me a while to get all the amount and times just right, but lets say I am shooting for about 50IBU, and I know I am getting 30 IBUs from my bitter charge, then I know I have to limit my final additions to stay at 20IBU's (which is in the 5th column, and you cut that one out of your screen shot) and if I plan to do a steep/whirlpool, then I usually add that charge to my recipe first, then work backwards to figure out what I can do at the 0,5,10 min marks etc.). Then I have a choice to either reduce my bitter charge, or I will play with my water profile a little bit, and increase/decrease the sulfate to chloride ratio. Higher sulfates with lower chloride will increase perceived bitterness and (to me) come out a little bit crisper and dryer mouthfeel, and higher chlorides to sulfates will decrease the bitterness but increase the mouthfeel resulting in a "creamier" type of mouthfeel.
I did not start out playing with water though, I only started playing with the hops and times, but as I started fine tuning my process and beers, thats when I started manipulating the beer with salts, so for now if I was you I would simply just adjust the hop addition amounts and times to fine tune where you want to be (but dont change the dry hops, only the hot side hops).
Hope that helps a little and doesnt confuse you