What is your acclimation process? Run us through you steps, including when you were dipping. *I just want to make sure you aren't starting with stressed frags.First 2 times I did coral rx and Bayer dip. This last time I just threw it in the tank...
Are you buying these frags from local reefers or maricultured pieces from the LFS?
You will regret not dipping. Stick to bayers and personally I'd suggest ditching the coral rx. I've never had a coral (sps specifically) stress from bayer's dips but I have stressed sps early on with coral rx.
Your issue could be lighting but if there are no pests, your flow is VERY strong and you have stable parameters I think you should at least be having some success with lower light sps like montipora.
Why are you nutrients rising?
EDIT: Just to be more specific you said you think your issue is lack of phosphate but state your phosphate is .05-.1 which is fine.