Mine is above 1500. I have also found that if the don't show polyp extension I have to move them to lower light for a week or 2 until they gain it back then slowly move back to desired spot. In 1 case I had to move one completely under a ledge to no direct light and very shadowed. Took 3 weeks to get it back and is now my 2nd largest.@Lost in the Sauce I used to have the same issue and was told mag above 1400 helps.
I started keeping mine right around 1400 and was able to start keeping them. Not sure where you keep your mag but may be worth a look.
Torches also like it