Heres Randys parameter article.
http://reefkeeping.com/issues/2004-05/rhf/
Keep in mind theses are flexible to the livestock you want to keep, and small swings and fluctuations are normal are normal. Imo in a younger tank these change as the rock ages anges its a lot slower than folk figure and it takes a while to truly become stable. The list is more recommended as guidelines and we dont fully know the impact on higher P no etc. from species to species. AS Sanjay And Rich Ross Both Said at macna, we didnt use to worry about po in the hobby and still had great tanks. Then you could test for them and now we worry about them.
Imo the testing is more to track the changes as we observe how the tank is metabolising the nutrients,cal and alk over time. The listed parameters are guidelines to keep you in the ball park. and esp with dosing insure were adding back in what is being used up and in vinegar dosing to insure we dont overstrip the nutrients. As the higher bacteria is eating the same food the corals and macro are.
As far as the brown jelly its quite possible its just a bacteria feeding on tissue loss on the coral and being fueld by the carbon dosing. The decline in the coral could be due to the low nutrients or flow or light or yout tank just isnt ready for those yet as it hasnt developed quite the magic blend it wants. Or, os most folks now are more concerned with bug removal in thier dipping they use a pesticide dip and not an anti bac or anti microbial or algae killer like Revive or Iodine or peroxide and a bacteria was introduced that likes the taste of frogspawn.
As much as we use the mantra dont chase numbers we all still do, and I have recently tried to not test

as much just to make sure im not chasing them. All the worst problems in my tank the numbers were fine if not perfect. I even drove to three LFS one day just to test the theory. the only thing that bit me in the but was cal alk and mag because as my nutrients rose to "unacceptable levels"and I increased the lighting, my stony corals took off and exploded with growth and I had a hard time keeping up with the mineral dosing.
My talbot shredded my dsb. That was the nutrient source.
The high alk is a bit of a prob but this.
11-14 alk is a problem. Not just that it's high but that's a very broad range. Stability is key! Imo way more important than the actual numbers themselves. Personally I wouldn't worry about the pH and I would not dose anything until absolutely necessary. Do small water changes every few weeks or so and you'll be fine.
No one thing youve got going is going to do any harm. Just make the slow gradual changes.
The Po is a bit of the stuff still coming off the rocks and as the biofioter ramps up itll reach a balance. its a young tank. fwiw if you put coral skeleton into salt water of a ph around 8 it dissolves minerals and phosphates esp on the surface of the rock and slowly makes its way into the rock until the most readily available and easily dissolved of those are removed. its part of what fuels the ugly phase.
Its really what I think youve got going on right now, but you set this tank up so well and fueled the biofilter so well your ugly phase is really pretty good looking. IMO
It really sounds like youve got this pretty close to dialed in.