If you're trying to be within style...
Your OG is a little high. Should be at or below 1.051. This would put your FG too high for style as well. You might reduce the Munich malt to achieve the lower OG as you're in the upper range (actually over) for SRMs and that's a bit much for Munich malt to fit the style. You might consider a little Cara-Pils too if you have it, although it's not necessary.
If you're doing a 10 gallon batch with 86% efficiency and a 90 min boil (which you should be doing with all of that pilsner malt), Beersmith is telling me you've got 18.2 IBUs, which is fine. However, I would consider switching the Spalt to 60 minutes (for a total of 21.3 IBUs... or slightly lessen the amount of Spalt to bring the IBUs back down). If you keep it at 20 min, you might have too much in the hop flavor department. Helles really don't need flavor or aroma hops.
The rest is in your procedure. Unlike many other styles of beer, Helles is more about technique (mash style/schedule, temp. control, etc.) than it is about ingredients. 100% Pilsner malt, 1 German Noble hop, and a German lager yeast can make a great Helles. It's really about technique.