Magnesium at 1250. Dose or not??

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I've had to just start dosing recently, however it's a 20gal heavily stocked with a mixed reef and it's been running for just over a year. However, my Mg stayed stable until October of last year when things started to really grow. I don't dose much, but I lose 20ppm over 2 weeks currently if I don't dose anything and just do my weekly 25% water change.

I do keep my Mg up at 1320 though. I found when my Mg dropped to 1280 and I left it, the corals began to slow down in growth. As soon as I bumped it up into the 1300's again, things started moving. Just some food for thought.