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I know this is probably a lost cause but is there anything i can do to stop RTN from progressing?
Frag it above the rtn.
John 
What's your alk at? Low?
Fast raise is probably ok. Use baking soda. It won't spike your pH.
Ok, dKH is now 11
Doublecheck your Ca, Mg, and specific gravity since other parameters may be off along with alk.
Doublecheck s.g. again if you have to dose other stuff.
Also, I think 11 may be a touch on the high side. Seems for me 9 is the magic number for most sps
My most recent numbers are: Mg 1360, KH 9.8, Ca 400, pH 8.3, sg 1.023, temp 76 F
Looks great. Usually most of us keep sg around 1.025-6
any ideas?
Ed