It is not Aefw if your birdnest is equally affected. Aefw are host specific.
That does not mean you do not have Aefw it only means that Aefw did not cause the decline in your birdnest. Many well seasoned veteran reefers have Aefw and don't even know it.
When you have decline in different species of corals it is likely water quality or water stability issues.
A nitrate of 25ppm will not cause a decline in your corals as noted on its own, nor will your lighting. There are lots of reefers who are successful with higher nitrates then 25ppm.
Your parameters on their own appear to be fine, however they are only a snapshot of your tank at that given moment in time. More important then the individual parameters are the stability of those parameters. You can be equally successful with a alkalinity if 7.5dkh as with an alkalinity of 11dkh. You will never be successful if your alkalinity is swinging from 7.5 to 11dkh.
Changing your lighting, changing your husbandry techniques or changing your filtration to try to find a cure will only lead to more instability in your system. Try to find a method that you want to use and stick to it.
Given that you have been unsuccessful before in keeping Sps you are demonstrating that you may not be able to provide these corals with the stability they require in order to not only survive but to thrive.
You appear to be successful with LPS. Lps have more of a tolerance to changes then most Sps. Maybe the best option is to continue with LPS and start with easier sps like pocillopora. Once you have mastered these, good colour, good growth then move on to some of the easier monti's and acro's.
The longer you take (many months or even years) and the more patience you demonstrate the more successful you will be. Rome wasn't built in a day.
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